Top 65 Slang For Retard – Meaning & Usage

In the world of slang, there are terms that evolve and change rapidly. Exploring the top slang words for “retard” may raise eyebrows, but it’s important to stay informed about the language people are using. Our team has put together a list that sheds light on this controversial topic, providing insight into the current vernacular landscape. So, buckle up and get ready to dive into this eye-opening listicle.

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1. Dimwit

This term is used to describe someone who is considered foolish or unintelligent. It is often used in a lighthearted or playful manner.

For example, “Don’t be such a dimwit, it’s obvious how to solve this problem.”
In a comedy show, a character might say, “I can’t believe I hired a dimwit like you.”
A friend might jokingly say, “Only a dimwit would forget their keys for the third time this week.”

2. Nitwit

This word is used to describe someone who is seen as silly or foolish. It is often used in a light-hearted or teasing way.

For instance, “You forgot your umbrella again? You’re such a nitwit.”
In a comedy sketch, a character might say, “I can’t believe I married a nitwit like you.”
A friend might playfully say, “You’re such a nitwit for thinking that would work.”

3. Dullard

This term is used to describe someone who is seen as boring or lacking intelligence. It is often used to express frustration or annoyance with someone’s lack of wit or excitement.

For example, “I can’t believe I have to spend the evening with that dullard.”
In a conversation about a boring party, someone might say, “It was full of dullards who had nothing interesting to say.”
A teacher might say, “I can’t stand having dullards in my class who don’t participate.”

4. Simpleton

This word is used to describe someone who is seen as naive or easily fooled. It is often used in a slightly derogatory manner.

For instance, “He fell for that old trick? What a simpleton.”
In a discussion about someone easily believing false information, one might say, “They’re such a simpleton for believing everything they hear.”
A friend might jokingly say, “You’re such a simpleton, always falling for pranks.”

5. Blockhead

This term is used to describe someone who is seen as thick-headed or lacking intelligence. It is often used in a playful or teasing manner.

For example, “I can’t believe you forgot your keys again, you blockhead.”
In a comedy skit, a character might say, “I’ve never met a bigger blockhead than you.”
A friend might playfully say, “You’re such a blockhead for not realizing the answer was right in front of you.”

6. Dolt

A dolt is a derogatory term used to describe someone who is considered unintelligent or foolish. It is often used to mock or insult someone’s lack of intelligence.

For example, “He’s such a dolt, he can’t even tie his own shoes.”
In a heated argument, one person might say, “Don’t listen to him, he’s just a dolt.”
A frustrated teacher might say, “I can’t believe I have to deal with dolts like him every day.”

7. Imbecile

An imbecile is an offensive term used to describe someone who is considered extremely stupid or mentally deficient. It is a harsher and more severe insult than “idiot” or “fool”.

For instance, “She’s a complete imbecile, she can’t even do basic math.”
In a discussion about someone’s poor decision-making, one might say, “Only an imbecile would think that’s a good idea.”
A frustrated parent might exclaim, “I can’t believe my child is acting like such an imbecile.”

8. Moron

A moron is a derogatory term used to describe someone who is considered very foolish or lacking in intelligence. It is often used to insult or belittle someone’s intellectual abilities.

For example, “He’s such a moron, he can’t even spell his own name.”
In a conversation about someone’s poor judgment, one might say, “What a moron, who would do something like that?”
A frustrated coworker might mutter, “I can’t believe I have to work with morons like him.”

9. Idiot

An idiot is a derogatory term used to describe someone who is considered extremely foolish or lacking in intelligence. It is often used to insult or criticize someone’s actions or decisions.

For instance, “He’s such an idiot, he can’t even follow simple instructions.”
In a discussion about someone’s poor performance, one might say, “What an idiot, he can’t even do his job properly.”
A frustrated friend might exclaim, “I can’t believe you did that, you’re such an idiot.”

10. Fool

A fool is a derogatory term used to describe someone who is considered foolish or lacking in good judgment. It is often used to mock or criticize someone’s actions or decisions.

For example, “He’s such a fool, he doesn’t realize how much trouble he’s causing.”
In a conversation about someone’s gullibility, one might say, “Don’t be a fool, they’re just trying to take advantage of you.”
A frustrated parent might scold, “Stop acting like a fool and start taking responsibility for your actions.”

11. Dope

A derogatory term used to describe someone who is unintelligent or foolish. “Dope” is often used as slang to insult someone’s intelligence.

For example, “He’s such a dope, he can’t even tie his own shoelaces.”
In a heated argument, one person might say, “Stop acting like a dope and listen to reason.”
A group of friends might tease each other by saying, “You’re such a dope, you forgot your own birthday!”

12. Lamebrain

A term used to describe someone who is slow-witted or dull. “Lamebrain” implies a lack of intelligence or common sense.

For instance, “She’s a total lamebrain, she can never remember anything.”
In a discussion about academic performance, someone might say, “I can’t believe I got paired up with a lamebrain for the group project.”
Friends jokingly tease each other by saying, “Don’t be such a lamebrain, it’s just a simple math problem.”

13. Ignoramus

A derogatory term used to describe someone who is lacking in knowledge or awareness. “Ignoramus” suggests that the person is willfully ignorant or refuses to educate themselves.

For example, “He’s such an ignoramus, he doesn’t even know basic geography.”
In a debate about current events, someone might say, “Only an ignoramus would believe that conspiracy theory.”
Friends might playfully insult each other by saying, “You’re such an ignoramus, you still think the Earth is flat!”

14. Doofus

A light-hearted term used to describe someone who is silly or foolish. “Doofus” is often used in a playful or teasing manner.

For instance, “He’s such a doofus, always tripping over his own feet.”
In a friendly conversation, one person might say, “Don’t be a doofus, it’s just a joke.”
Friends might affectionately tease each other by saying, “You’re such a doofus, but that’s why we love you!”

15. Halfwit

A term used to describe someone who is lacking in intelligence or mental capacity. “Halfwit” suggests that the person is only halfway to being fully intelligent.

For example, “He’s a complete halfwit, he can’t even solve a simple puzzle.”
In a discussion about academic performance, someone might say, “I can’t believe I have to tutor a halfwit.”
Friends might playfully insult each other by saying, “You’re such a halfwit, you couldn’t even find your way out of a paper bag!”

16. Knucklehead

This term is used to describe someone who is foolish or lacking in intelligence. It is often used in a playful or lighthearted manner.

For example, a friend might say, “You forgot your keys again? You’re such a knucklehead.”
In a comedy movie, a character might be called a knucklehead for constantly getting into silly situations.
A parent might affectionately refer to their child as a knucklehead when they do something silly but harmless.

17. Retard

This word is considered highly offensive and derogatory. It is used to insult and demean individuals with intellectual disabilities, and its usage is widely condemned.

It is important to note that using this term is disrespectful and perpetuates harmful stereotypes.
Instead of using this word, it is recommended to use respectful and inclusive language when referring to individuals with intellectual disabilities.
It is crucial to treat all individuals with respect and dignity, regardless of their abilities.

18. Slowpoke

This term is used to describe someone who is slow in their actions or thought processes. It is often used in a light-hearted or teasing manner.

For instance, a friend might say, “Come on, slowpoke! We’re going to be late.”
In a playful argument, one person might say, “You’re such a slowpoke, it takes you forever to make a decision.”
A parent might affectionately call their child a slowpoke when they are taking a long time to get ready.

19. Chump

This term is used to describe someone who is easily fooled or taken advantage of. It is often used in a slightly derogatory manner.

For example, a friend might say, “Don’t be a chump and fall for that scam.”
In a discussion about relationships, one person might say, “I can’t believe she cheated on him. He’s such a chump.”
A person might jokingly call themselves a chump when they make a silly mistake.

20. Lunkhead

This term is used to describe someone who is not very intelligent or coordinated. It is often used in a playful or teasing manner.

For instance, a friend might say, “Watch where you’re going, you lunkhead!”
In a comedy movie, a character might be called a lunkhead for constantly making clumsy mistakes.
A parent might affectionately call their child a lunkhead when they do something silly but harmless.

21. Buffoon

Buffoon is a derogatory term used to describe someone who is foolish or stupid. It implies a lack of intelligence or common sense.

For example, “Don’t listen to him, he’s just a buffoon.”
In a comedic context, someone might say, “He always plays the buffoon in our skits.”
A person might use the term to describe a clumsy or foolish action, such as, “I can’t believe I tripped over my own feet, what a buffoon!”

22. Clod

Clod is a slang term used to insult someone by calling them stupid or unintelligent. It suggests that the person is dull or slow-witted.

For instance, “He’s such a clod, he can’t even tie his own shoelaces.”
In a frustrated tone, someone might say, “Why do I have to work with such clods?”
A person might use the term to describe someone who consistently makes foolish mistakes, such as, “He’s a clod when it comes to handling technology.”

23. Yokel

Yokel is a derogatory term used to describe someone who is considered unsophisticated or ignorant, typically from a rural or small-town background. It implies a lack of sophistication or worldly knowledge.

For example, “Don’t mind him, he’s just a yokel from the countryside.”
In a condescending tone, someone might say, “You can always tell a yokel by their lack of manners.”
A person might use the term to describe someone who is naive or easily fooled, such as, “He fell for that scam like a true yokel.”

24. Cretin

Cretin is a derogatory term used to insult someone by suggesting they are mentally deficient or intellectually disabled. It is an offensive term that should be avoided.

For instance, “I can’t believe he said that, what a cretin.”
In a heated argument, someone might say, “You’re acting like a complete cretin right now.”
A person might use the term to express frustration or disbelief, such as, “I can’t believe I have to deal with these cretins every day.”

25. Dweeb

Dweeb is a slang term used to describe someone who is considered socially awkward, uncool, or overly studious. It suggests a lack of social skills or popularity.

For example, “He’s such a dweeb, always buried in his books.”
In a teasing tone, someone might say, “Look at that dweeb over there, he can’t even talk to a girl.”
A person might use the term to describe someone who is obsessed with a particular subject or hobby, such as, “He’s a total dweeb when it comes to comic books.”

26. Schmuck

Schmuck is a derogatory term used to describe a foolish or stupid person. It is often used in a playful or sarcastic manner.

For example, “Don’t be such a schmuck and forget your keys again.”
In a heated argument, someone might say, “You’re acting like a complete schmuck right now.”
A person might jokingly refer to themselves as a schmuck, saying, “I can’t believe I spilled coffee on my shirt again. I’m such a schmuck.”

27. Wally

Wally is a slang term used to describe a person who is foolish, clumsy, or lacking in intelligence. It is often used in a light-hearted or teasing manner.

For instance, “He’s always tripping over his own feet. What a wally!”
In a group of friends, someone might playfully say, “You’re such a wally for forgetting your lunch.”
A person might use the term to describe themselves, saying, “I feel like a wally for not understanding that simple math problem.”

28. Dork

Dork is a slang term used to describe a person who is socially awkward, eccentric, or overly enthusiastic about niche interests. It is often used in a light-hearted or affectionate manner.

For example, “He’s a total dork when it comes to comic books.”
A group of friends might tease each other, saying, “We’re all a bunch of dorks for spending our Friday nights playing board games.”
Someone might self-identify as a dork, saying, “I embrace my inner dork and proudly wear my Star Wars T-shirt.”

29. Nimrod

Nimrod is a slang term used to describe a person who is foolish, inept, or lacking in skill. It is often used sarcastically or mockingly.

For instance, “He couldn’t even tie his own shoelaces. What a nimrod!”
In a sports context, someone might say, “He missed an easy shot. What a nimrod.”
A person might use the term to describe themselves jokingly, saying, “I managed to spill coffee on my keyboard. I’m such a nimrod.”

30. Meathead

Meathead is a slang term used to describe a person who is stupid, slow-witted, or lacking in intelligence. It is often used in a derogatory or mocking manner.

For example, “He’s such a meathead. He can never understand simple instructions.”
In a heated argument, someone might say, “Don’t listen to him, he’s just a meathead.”
A person might use the term to describe themselves jokingly, saying, “I completely forgot my own birthday. I’m such a meathead.”

31. Muppet

This term is used to refer to someone who is perceived as foolish or stupid. It originated from the popular puppet characters in the television show “The Muppet Show”.

For example, “Don’t be such a muppet, it’s obvious how to do this.”
In a playful banter, one might say, “You’re acting like a complete muppet right now.”
A person might use this term jokingly, “I can’t believe I did that, I’m such a muppet.”

32. Neanderthal

This term is used to insult someone by comparing them to the early human species, Neanderthals, who are perceived as lacking intelligence or sophistication.

For instance, “Stop behaving like a Neanderthal and use your brain.”
In a heated argument, someone might say, “You’re acting like a Neanderthal with that attitude.”
A person might use this term to describe someone’s outdated beliefs, “His views on gender equality are so Neanderthal.”

33. Peabrain

This term is used to insult someone by suggesting that their brain is small or lacking in intelligence.

For example, “Why are you being such a peabrain? Can’t you understand a simple concept?”
In a sarcastic tone, one might say, “Wow, what a genius idea. Only a peabrain could come up with that.”
A person might use this term playfully, “I forgot my keys again, I must have a peabrain.”

34. Pinhead

This term is used to insult someone by suggesting that their head is small, implying a lack of intelligence.

For instance, “Don’t listen to him, he’s just a pinhead.”
In a teasing manner, one might say, “Watch out, we have a pinhead over here.”
A person might use this term to describe someone’s foolish mistake, “I can’t believe I forgot my own birthday, what a pinhead move.”

35. Putz

This term is used to insult someone by suggesting that they are foolish or stupid. It originated from Yiddish and is often used in a joking or playful manner.

For example, “Stop being such a putz and start paying attention.”
In a light-hearted conversation, one might say, “You’re such a putz, but that’s why I love you.”
A person might use this term to describe someone’s clumsy actions, “I tripped over my own feet, what a putz move.”

36. Schlemiel

This Yiddish term is used to describe someone who is often unlucky or accident-prone. It can also refer to someone who is easily taken advantage of or who frequently makes foolish mistakes.

For example, “He spilled his coffee on himself again? What a schlemiel!”
Someone might say, “I’m such a schlemiel, I always trip over my own feet.”
In a discussion about unfortunate events, a person might comment, “I feel like a schlemiel today, everything is going wrong.”

37. Schmo

This slang term is used to describe someone who is easily fooled or manipulated. It can also refer to someone who is considered naive or lacking common sense.

For instance, “Don’t be such a schmo, it’s obviously a scam.”
A person might say, “He fell for the prank? What a schmo!”
In a conversation about making poor decisions, someone might comment, “I can’t believe I trusted that schmo with my money.”

38. Schmendrick

This Yiddish term is used to describe someone who is considered clumsy, foolish, or inept. It can also be used to refer to someone who is socially awkward or lacking in intelligence.

For example, “He can’t even tie his own shoelaces? What a schmendrick!”
Someone might say, “I feel like a schmendrick, I can’t figure out how to use this new technology.”
In a discussion about someone’s lack of skills, a person might comment, “He’s such a schmendrick, he can’t even change a lightbulb.”

39. Schlemazel

This Yiddish term is used to describe someone who is considered extremely unlucky or consistently experiences misfortune. It can also refer to someone who is seen as a perpetual victim of circumstances.

For instance, “He lost his wallet again? What a schlemazel!”
A person might say, “I spilled coffee on my white shirt, I’m such a schlemazel.”
In a conversation about bad luck, someone might comment, “I always seem to be the schlemazel who gets caught in the rain without an umbrella.”

40. Schnook

This slang term is used to describe someone who is gullible, easily fooled, or taken advantage of. It can also refer to someone who is considered naive or lacking in street smarts.

For example, “He believed that obvious lie? What a schnook!”
Someone might say, “Don’t be a schnook, always double-check before giving out personal information.”
In a discussion about trusting the wrong people, a person might comment, “I was such a schnook for believing his promises.”

41. Slacker

This term is used to describe someone who is perceived as lazy or lacking motivation.

For example, “He never does any work and is always just hanging out, he’s such a slacker.”
A teacher might say, “You need to stop being a slacker and start putting in some effort.”
In a conversation about work ethic, someone might comment, “I can’t stand working with slackers who don’t pull their weight.”

42. Spastic

This term is considered highly offensive and derogatory towards people with disabilities, particularly those with cerebral palsy.

For instance, “Using the term ‘spastic’ to insult someone is completely unacceptable.”
A disability advocate might say, “It’s important to educate others about the harm and stigma associated with using the word ‘spastic’.”
In a discussion about inclusive language, someone might point out, “Using derogatory terms like ‘spastic’ perpetuates ableism and discrimination.”

43. Thicko

This slang term is used to describe someone who is perceived as unintelligent or lacking in mental capacity.

For example, “He couldn’t understand the simplest instructions, he’s such a thicko.”
A friend might jokingly say, “You’re such a thicko sometimes, it’s hilarious.”
In a conversation about academic abilities, someone might comment, “Just because someone struggles in school doesn’t mean they’re a thicko.”

44. Tool

This term is used to describe someone who is perceived as foolish, ignorant, or lacking in common sense.

For instance, “He always says the dumbest things, he’s such a tool.”
A friend might tease, “Stop acting like a tool and think before you speak.”
In a discussion about intelligence, someone might comment, “Being a tool has more to do with attitude than actual intelligence.”

45. Wazzock

This slang term is used to describe someone who is perceived as foolish, silly, or lacking in intelligence.

For example, “He keeps making the same mistakes over and over, he’s such a wazzock.”
A friend might playfully say, “You’re such a wazzock, but that’s why I love you.”
In a conversation about making poor decisions, someone might comment, “I can’t believe I did something so wazzock-like.”

46. Zilch

This word is slang for “nothing” or “zero”. It is sometimes used to describe someone as having no intelligence or understanding.

For example, “He knows zilch about math.”
In a conversation about a person’s knowledge, one might say, “He’s got zilch in his head.”
Another person might use it to describe a lack of progress, saying, “We’ve made zilch in terms of improvement.”

47. Zombie

In slang, “zombie” can be used to describe someone who is unresponsive or lacks awareness. It can be used to imply a lack of intelligence or mental capacity.

For instance, “He just sits there like a zombie, not reacting to anything.”
In a discussion about a person’s behavior, one might say, “She’s like a zombie, never engaging in conversation.”
Another person might use it to describe a lack of emotion, saying, “He’s like a zombie, showing no signs of happiness or sadness.”

48. Dingleberry

This slang term is often used to insult or mock someone by calling them an idiot or a fool. It is considered derogatory and offensive.

For example, “Don’t listen to him, he’s just a dingleberry.”
In a heated argument, one person might say, “You’re such a dingleberry, you don’t know what you’re talking about.”
Another person might use it in a sarcastic manner, saying, “Wow, you’re a real genius, aren’t you? Dingleberry.”

49. Dweezil

This word is a slang term used to refer to a stupid or foolish person. It is meant to be derogatory and offensive.

For instance, “He’s such a dweezil, he can’t even tie his own shoes.”
In a conversation about someone’s intelligence, one might say, “She’s a complete dweezil, she can’t understand basic concepts.”
Another person might use it to insult someone’s decision-making, saying, “What a dweezil move, why would you do that?”

50. Dweezle

This slang term is used to describe someone who is foolish or lacking in intelligence. It is a derogatory term and should be used with caution.

For example, “He’s such a dweezle, he can’t even solve a simple puzzle.”
In a discussion about someone’s mental capabilities, one might say, “She’s a total dweezle, she can’t grasp basic concepts.”
Another person might use it to mock someone’s decision-making, saying, “What a dweezle move, that was clearly the wrong choice.”

51. Special

This term is used to refer to individuals with intellectual disabilities. It is important to note that using this term as slang is offensive and disrespectful.

For example, “My cousin is special and attends a special education program.”
In a discussion about inclusive education, someone might say, “We should ensure that all students, including those who are special, have access to quality education.”
A parent might advocate for their child by saying, “My special child deserves equal opportunities and support.”

52. Slow

This term is used to describe individuals who have cognitive impairments or developmental delays. It is important to use this term with sensitivity and respect.

For instance, “He has a slow learning pace, but he is making progress.”
In a conversation about inclusion, someone might say, “We need to provide support and accommodations for students who are slow in their learning.”
A teacher might discuss strategies for teaching students with slow processing speed by saying, “We should provide extra time and visual aids for students who are slow in processing information.”

53. Dumbbell

This term is used to describe individuals with intellectual impairments or limitations. It is derogatory to use this term as slang.

For example, “She has a cognitive disability and is considered intellectually impaired.”
In a discussion about inclusive employment, someone might say, “We should create opportunities for individuals who are dumbbell to contribute to the workforce.”
A disability advocate might argue, “Using derogatory terms like dumbbell perpetuates discrimination against individuals with intellectual impairments.”

54. R-word

This term is a derogatory slang used to insult individuals with intellectual disabilities. It is highly offensive and disrespectful. It is important to avoid using this term.

For instance, “Using the R-word is hurtful and perpetuates stigma.”
In a conversation about inclusive language, someone might say, “We should replace the R-word with more respectful and inclusive language.”
A disability rights advocate might raise awareness by saying, “Let’s spread the message that using the R-word is never acceptable.”

55. Dumb

This term is used to describe individuals with intellectual challenges or limitations. It is important to use this term with sensitivity and respect.

For example, “He has a learning disability and is considered intellectually dumb.”
In a discussion about inclusive education, someone might say, “We should provide support and accommodations for students who are dumb in their learning.”
A teacher might discuss strategies for teaching students with intellectual challenges by saying, “We should focus on their strengths and provide individualized support for students who are dumb.”

56. Window licker

This offensive term refers to someone with intellectual disabilities who is perceived as staring out of a window and licking it. It is highly disrespectful and should not be used.

This term is an example of ableism and should be avoided in all contexts.
Using derogatory terms like “window licker” perpetuates harmful stereotypes and marginalizes individuals with disabilities.
It is important to promote inclusivity and respect for all individuals, regardless of their abilities.

57. Potato

This offensive term compares a person with intellectual disabilities to a potato, implying that they are mentally slow or unintelligent. It is highly derogatory and should never be used.

Using terms like “potato” to mock individuals with disabilities is hurtful and disrespectful.
It is important to treat all individuals with dignity and respect, regardless of their abilities.
Promoting inclusivity means refraining from using derogatory language and challenging others who do.

58. Helmet

This derogatory term is used to mock or insult individuals with intellectual disabilities, comparing them to someone who wears a helmet for protection. It is offensive and disrespectful.

Using terms like “helmet” to demean individuals with disabilities is harmful and perpetuates ableism.
It is important to promote empathy and understanding towards individuals with disabilities, rather than using derogatory language.
Instead of using derogatory terms, let’s focus on creating inclusive and supportive environments for all individuals.

59. Short bus rider

This offensive term refers to a person with intellectual disabilities who rides a special education bus, implying that they are less intelligent or capable. It is derogatory and should be avoided.

Using terms like “short bus rider” to mock individuals with disabilities is hurtful and disrespectful.
It is important to challenge and reject derogatory language that perpetuates stereotypes and marginalizes individuals with disabilities.
Promoting inclusivity means treating all individuals with respect and dignity, regardless of their abilities.

60. Village idiot

This derogatory term is used to insult or belittle individuals with intellectual disabilities, suggesting that they are foolish or unintelligent. It is offensive and disrespectful.

Using terms like “village idiot” to mock individuals with disabilities perpetuates harmful stereotypes and marginalizes them.
It is crucial to promote acceptance and respect for individuals with disabilities, rather than using derogatory language.
Let’s focus on creating inclusive communities that celebrate diversity and support individuals of all abilities.

61. Mong

A derogatory term used to insult someone with intellectual disabilities. This term is highly offensive and disrespectful. Its usage perpetuates ableism and discrimination against individuals with disabilities.

For example, “Stop being such a mong, you’re embarrassing yourself.”
A person might say, “Don’t be a mong and do something stupid.”
Another might insult someone by calling them a “stupid mong.”

62. Lame

A term used to describe something or someone as uncool, boring, or uninteresting. It is often used as an insult to belittle someone or criticize something.

For instance, “That party was so lame, nothing exciting happened.”
A person might say, “Don’t be lame and miss out on all the fun.”
Another might insult someone by calling them a “lame loser.”

63. Dummy

A term used to refer to someone who is considered stupid, foolish, or lacking intelligence. It is often used as an insult to mock or belittle someone.

For example, “You’re such a dummy for not knowing the answer.”
A person might say, “Don’t be a dummy and make the same mistake again.”
Another might insult someone by calling them a “dumb dummy.”

64. Numpty

A term used to describe someone who is considered incompetent, foolish, or lacking common sense. It is often used as an insult to mock or criticize someone’s abilities.

For instance, “He’s such a numpty, he can’t even tie his own shoelaces.”
A person might say, “Don’t be a numpty and mess up the task.”
Another might insult someone by calling them a “stupid numpty.”

65. Knobhead

A term used to insult someone by calling them an idiot or a jerk. It is a vulgar and offensive term that is meant to demean or belittle someone.

For example, “Stop being such a knobhead and leave me alone.”
A person might say, “Don’t be a knobhead and ruin the party.”
Another might insult someone by calling them a “stupid knobhead.”