Top 49 Slang For Craziness – Meaning & Usage

When it comes to expressing craziness in everyday conversations, language can sometimes fall short. But fear not, because we’ve got your back! Our team has scoured the depths of slang culture to bring you a curated list of the most vibrant and expressive terms that capture the essence of craziness like never before. Get ready to spice up your vocabulary and add some flair to your expressions with these offbeat and lively phrases.

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1. Bonkers

Used to describe something or someone that is completely out of control or irrational.

For example, “The party last night was bonkers! People were dancing on tables and singing at the top of their lungs.”
A person might say, “I can’t believe she quit her stable job to become a professional skydiver. She’s absolutely bonkers.”
In a conversation about a wild roller coaster, someone might exclaim, “That ride is bonkers! It goes upside down and twists in every direction!”

2. Loony

Refers to someone who is mentally unstable or behaving in an irrational or eccentric manner.

For instance, “He’s acting like a loony, talking to himself and wearing mismatched socks.”
If someone is doing something bizarre, a person might say, “Are you feeling loony today? Why are you wearing a banana costume to work?”
In a discussion about a crazy conspiracy theory, someone might comment, “Only a loony person would believe something so far-fetched.”

3. Nutty

Used to describe someone or something that is strange, eccentric, or unconventional.

For example, “She’s always coming up with nutty ideas that no one else would think of.”
If someone is behaving oddly, a person might say, “What’s gotten into you? You’re acting really nutty today.”
In a conversation about a unique fashion trend, someone might comment, “That outfit is totally nutty, but I love it!”

4. Wacko

Refers to someone who is mentally unstable or behaving in a bizarre or irrational manner.

For instance, “He went wacko and started throwing things around the room.”
If someone is acting strangely, a person might say, “Stay away from that guy, he’s a total wacko.”
In a discussion about a strange belief or theory, someone might comment, “That idea is completely wacko. There’s no evidence to support it.”

5. Cuckoo

Used to describe someone or something that is mentally unstable or behaving in an irrational or unpredictable way.

For example, “She’s gone completely cuckoo. She keeps talking to her imaginary friend.”
If someone is doing something outrageous, a person might say, “You’re driving me cuckoo with your constant pranks.”
In a conversation about a chaotic situation, someone might comment, “It was pure cuckoo at the concert last night. People were pushing and shoving to get to the front.”

6. Batty

This term is used to describe someone or something that is mentally unstable or behaving in an irrational manner. It can also be used to describe a situation or idea that is extremely strange or unconventional.

For example, “He went completely batty after losing his job.”
In a discussion about unusual behavior, someone might say, “That guy is a little batty, don’t you think?”
Another might exclaim, “The plot of that movie was absolutely batty!”

7. Nuts

This slang term is used to describe something or someone as crazy or mentally unstable. It can also be used to express disbelief or surprise.

For instance, “She’s driving me nuts with her constant nagging.”
In a conversation about a wild party, someone might say, “That party was totally nuts!”
Another might exclaim, “You want to go skydiving? Are you nuts?”

8. Bananas

This term is used to describe something or someone as crazy, insane, or extremely unusual. It can also be used to express excitement or disbelief.

For example, “That’s a bananas idea, but it just might work.”
In a discussion about a chaotic situation, someone might say, “Everything went bananas after the power outage.”
Another might exclaim, “I can’t believe I won the lottery! This is bananas!”

9. Off the rocker

This slang phrase is used to describe someone as mentally unstable or behaving in an irrational manner. It can also be used to describe a situation or idea as extremely strange or unconventional.

For instance, “Ever since she lost her job, she’s been completely off her rocker.”
In a conversation about bizarre behavior, someone might say, “His actions were totally off the rocker.”
Another might exclaim, “The plot of that movie was completely off the rocker!”

10. Cray-cray

This slang term is a playful way to describe someone or something as crazy or mentally unstable. It is an abbreviation of the word “crazy” and is often used in a lighthearted or exaggerated manner.

For example, “She’s acting all cray-cray lately.”
In a discussion about a wild party, someone might say, “The dance floor was cray-cray!”
Another might exclaim, “You want to go bungee jumping? That’s cray-cray!”

11. Loopy

This term is used to describe someone who is acting in a strange or eccentric manner. It can also refer to someone who is mentally unstable or unpredictable.

For example, “He’s been acting really loopy lately, talking to himself and laughing at nothing.”
A friend might say, “You’re loopy if you think that’s a good idea.”
In a conversation about a bizarre situation, someone might comment, “That whole situation was just loopy.”

12. Out of one’s mind

This phrase is used to describe someone who is behaving in an irrational or insane manner. It suggests that the person has lost touch with reality or is not thinking clearly.

For instance, “She was out of her mind with grief after the loss of her pet.”
Someone might say, “I must have been out of my mind to agree to that.”
In a discussion about a reckless decision, a person might admit, “I was completely out of my mind when I did that.”

13. Barmy

This term is used to describe someone or something that is considered foolish, nonsensical, or crazy. It can also suggest that someone is slightly mad or eccentric.

For example, “That’s a barmy idea, it will never work.”
A person might say, “He’s a bit barmy, always coming up with wild theories.”
In a conversation about a ridiculous situation, someone might comment, “The whole thing is just barmy.”

14. Demented

This word is used to describe someone who is mentally disturbed or suffering from a severe form of insanity. It suggests a loss of mental faculties and a lack of rationality.

For instance, “He went demented after the tragic accident.”
Someone might say, “That’s a demented idea, it will never work.”
In a discussion about a deranged individual, a person might comment, “He’s completely demented, you never know what he’ll do next.”

15. Mad as a hatter

This phrase is used to describe someone who is completely crazy or insane. It originates from the character of the Mad Hatter in Lewis Carroll’s “Alice’s Adventures in Wonderland.”

For example, “She’s as mad as a hatter, always talking to imaginary friends.”
A person might say, “You’d have to be mad as a hatter to believe that.”
In a discussion about an irrational decision, someone might comment, “That’s mad as a hatter, no one in their right mind would do that.”

16. Off one’s trolley

This phrase is used to describe someone who is behaving in an irrational or nonsensical manner. It suggests that the person has completely lost their mental stability or is acting in a way that is completely out of touch with reality.

For example, “After staying up all night, he was completely off his trolley and started talking to imaginary friends.”
In a conversation about someone’s strange behavior, one might say, “She’s been acting off her trolley lately, talking to herself and laughing for no reason.”
When describing an outrageous event, someone might exclaim, “That party last night was off its trolley, with people dancing on tables and throwing food everywhere!”

17. Nutso

This slang term is used to describe someone or something that is extremely irrational, eccentric, or out of control. It implies a level of craziness that goes beyond normal or expected behavior.

For instance, “His reaction to the news was completely nutso, screaming and throwing things.”
In a discussion about a wild party, someone might say, “It was absolute nutso, with people jumping off the roof into the pool.”
When describing a chaotic situation, one might comment, “The traffic during rush hour is always nutso, with cars honking and cutting each other off.”

18. Cuckoo for Cocoa Puffs

This phrase is a playful way to describe someone who is excessively enthusiastic, obsessed, or behaving in a bizarre manner. It refers to the character Sonny the Cuckoo Bird from the Cocoa Puffs cereal commercials, who is known for his uncontrollable craving for the cereal.

For example, “She’s absolutely cuckoo for Cocoa Puffs when it comes to collecting comic books.”
In a conversation about someone’s unusual hobbies, one might say, “He’s really cuckoo for Cocoa Puffs with his stamp collection.”
When describing someone’s extreme excitement, someone might exclaim, “She went completely cuckoo for Cocoa Puffs when she found out she won the lottery!”

19. Whacko

This slang term is used to describe someone who is mentally unstable, eccentric, or behaving in a bizarre manner. It suggests that the person’s behavior is unusual or irrational.

For instance, “He’s a bit of a whacko, always talking to himself and wearing mismatched socks.”
In a discussion about someone’s strange habits, one might say, “She’s a total whacko when it comes to organizing her books by color.”
When describing an outrageous event, one might comment, “The protest turned whacko when people started throwing paint and dancing in the streets.”

20. Gonzo

This term is used to describe something that is wild, unconventional, or extreme. It can be used to describe a person, an event, or a style of writing or journalism that is characterized by its boldness and disregard for traditional norms.

For example, “He’s known for his gonzo style of reporting, diving headfirst into risky situations.”
In a conversation about a thrilling adventure, someone might say, “That roller coaster ride was totally gonzo, with twists and turns that left us screaming.”
When describing a bold fashion choice, one might comment, “Her outfit was completely gonzo, with mismatched patterns and bright colors.”

21. Out to lunch

This phrase is often used to describe someone who is behaving in an irrational or nonsensical manner. It implies that the person is not thinking clearly or is disconnected from reality.

For example, “His ideas are so out to lunch, I don’t know how anyone takes him seriously.”
In a discussion about a person’s strange behavior, someone might say, “She’s completely out to lunch lately.”
Another usage could be, “The suspect’s actions were out to lunch, making it difficult to understand their motives.”

22. Off the wall

This phrase is used to describe something that is unusual, eccentric, or unexpected. It implies that the subject is deviating from the norm or going against conventional behavior or thinking.

For instance, “His fashion sense is really off the wall, but it’s refreshing.”
In a conversation about a unique art piece, someone might say, “That sculpture is completely off the wall.”
Another usage could be, “Her ideas for the project were off the wall, but they actually worked.”

23. Out of your mind

This phrase is used to describe someone who is acting in a completely irrational or insane manner. It suggests that the person’s thoughts or behavior are detached from reality or sanity.

For example, “You must be out of your mind if you think that plan will work.”
In a discussion about a person’s reckless actions, someone might say, “He’s completely out of his mind, risking his life like that.”
Another usage could be, “The suspect’s behavior was out of their mind, leading to their arrest.”

24. Bizarre

This word is used to describe something that is extremely strange, peculiar, or out of the ordinary. It implies that the subject is unconventional or odd in a way that catches attention.

For instance, “The movie had a bizarre plot twist that left the audience in shock.”
In a conversation about a peculiar event, someone might say, “It was a bizarre coincidence that we both had the same dream.”
Another usage could be, “The suspect’s behavior was bizarre, leaving everyone puzzled.”

25. Daft

This word is used to describe someone who is acting in a silly, foolish, or nonsensical manner. It suggests that the person lacks common sense or is behaving in a ridiculous way.

For example, “Stop being daft and listen to reason.”
In a discussion about a person’s funny behavior, someone might say, “He’s always coming up with daft ideas.”
Another usage could be, “Her daft comments often lighten the mood in tense situations.”

26. Unhinged

This term is used to describe someone who is mentally unstable or irrational. It suggests a lack of control or stability in their thoughts or actions.

For example, “After losing his job, he became completely unhinged and started acting erratically.”
In a political context, someone might say, “The candidate’s unhinged behavior during the debate was concerning.”
A person describing a chaotic situation might say, “The party last night was unhinged, with people dancing on tables and throwing drinks.”

27. Cracked

Similar to “unhinged,” this term is used to describe someone who is mentally unstable or irrational. It implies a sense of brokenness or damage in their mental state.

For instance, “He’s cracked; he keeps talking to himself and doesn’t make any sense.”
In a conversation about mental health, someone might say, “People with cracked minds often struggle to function in society.”
A person describing a bizarre or irrational behavior might say, “Her decision to quit her job and move to a remote island seems cracked.”

28. Gaga

This term is used to describe someone who is crazy or eccentric, often in a positive or endearing way. It suggests a sense of enthusiasm or obsession.

For example, “She’s gaga over that new band; she went to all their concerts.”
In a discussion about fashion, someone might say, “His style is totally gaga; he always wears the most outrageous outfits.”
A person describing their excitement might say, “I’m gaga about this new restaurant; the food is amazing!”

29. Zany

This term is used to describe someone or something that is quirky, eccentric, or unconventional. It suggests a sense of humor or playfulness.

For instance, “He’s such a zany character; you never know what he’s going to do next.”
In a conversation about comedy, someone might say, “That comedian’s zany antics always leave the audience in stitches.”
A person describing a funny or unusual situation might say, “We had a zany adventure last night; we ended up getting lost in the woods.”

30. Kooky

Similar to “zany,” this term is used to describe someone who is crazy or eccentric, often in a lighthearted or humorous way. It suggests a sense of quirkiness or unconventional behavior.

For instance, “She’s got a kooky sense of style; she always wears mismatched socks.”
In a discussion about art, someone might say, “The artist’s kooky sculptures always attract attention.”
A person describing a strange or odd behavior might say, “His kooky ideas often leave people scratching their heads.”

31. Spaced out

This slang term is used to describe someone who is not fully present or engaged in their surroundings. It can also imply a state of being under the influence of drugs.

For example, “Sorry, I was spaced out and didn’t hear what you said.”
A person might say, “I feel so spaced out after pulling an all-nighter.”
In a conversation about someone’s behavior, one might comment, “He’s been acting really spaced out lately.”

32. Freaky

This slang term is used to describe something or someone that is strange or out of the ordinary. It can also imply a sense of unease or discomfort.

For instance, “That horror movie was really freaky.”
A person might say, “I had a freaky experience last night. I saw a ghost!”
In a discussion about strange occurrences, someone might mention, “I’ve been having these freaky dreams lately.”

33. Screw loose

This slang term is used to describe someone who is considered mentally unstable or eccentric. It implies that there is something not quite right or functioning properly in their mind.

For example, “I think he’s got a screw loose. He keeps talking to himself.”
A person might say, “She’s a bit strange. I think she’s got a few screws loose.”
In a conversation about unusual behavior, one might comment, “There’s definitely a screw loose in his head.”

34. Wild

This slang term is used to describe something or someone that is exciting, extreme, or unconventional. It can also imply a lack of control or predictability.

For instance, “That party was wild! There was dancing on tables and people jumping into the pool.”
A person might say, “I had a wild night out. I ended up in a different city!”
In a discussion about adventurous activities, someone might mention, “Skydiving is such a wild experience.”

35. Nutter

This slang term is used to describe someone who is considered crazy or eccentric. It is often used in a lighthearted or playful manner.

For example, “He’s a bit of a nutter. He wears mismatched socks every day.”
A person might say, “She’s a total nutter. She collects rubber ducks.”
In a conversation about unusual hobbies, one might comment, “I met this nutter who collects belly button lint.”

36. Psycho

This term is used to describe someone who is mentally unstable or exhibits abnormal behavior. It can also be used more casually to describe someone who is acting irrationally or unpredictably.

For example, “That guy is a total psycho, he’s always talking to himself.”
In a discussion about a film character, someone might say, “The villain in that movie was a complete psycho.”
Another usage could be, “Don’t mind her, she’s just being psycho today.”

37. Cracked up

This phrase is used to describe someone who is experiencing a mental breakdown or is acting in an erratic or unpredictable manner.

For instance, “After losing his job, he completely cracked up and started screaming at everyone.”
In a conversation about a stressful situation, someone might say, “I’m so stressed, I feel like I’m about to crack up.”
Another usage could be, “She was so cracked up that she couldn’t even form coherent sentences.”

38. Loon

This term is used to describe someone who is considered to be crazy, eccentric, or mentally unstable. It can also be used in a more lighthearted or affectionate way to refer to someone who is just a bit odd or quirky.

For example, “That guy is a total loon, he believes in conspiracy theories.”
In a discussion about a character in a book, someone might say, “The protagonist’s neighbor is a loon, always doing strange things.”
Another usage could be, “Don’t mind her, she’s just a loon, but she means well.”

39. Whacked out

This phrase is used to describe someone who is acting in a bizarre or irrational manner, often due to being under the influence of drugs or alcohol. It can also be used more generally to describe someone who is out of touch with reality or behaving strangely.

For instance, “After taking that drug, he was completely whacked out and started hallucinating.”
In a conversation about a strange incident, someone might say, “Did you see that guy running around naked? He was totally whacked out.”
Another usage could be, “She’s been acting whacked out lately, I think something’s going on with her.”

40. Nutjob

This term is used to describe someone who is considered to be crazy, mentally unstable, or exhibiting abnormal behavior. It is often used in a derogatory or dismissive manner.

For example, “That guy is a total nutjob, he thinks he can talk to aliens.”
In a discussion about a news story, someone might say, “The person who committed that crime must be a complete nutjob.”
Another usage could be, “Don’t pay attention to him, he’s just a nutjob trying to get attention.”

41. Wacky

Wacky refers to something or someone that is unconventional, offbeat, or strange in a playful or amusing way.

For example, “That comedian’s jokes are always wacky and unpredictable.”
A person might describe a party as, “It was a wacky night filled with unusual costumes and wild dancing.”
Someone might say, “I love your wacky sense of fashion. It’s so unique and fun!”

42. Coo-coo

Coo-coo is a slang term used to describe someone who is crazy or mentally unstable. It is often used in a lighthearted or playful manner.

For instance, “He’s acting coo-coo. I think he needs to take a break.”
A person might jokingly say, “I must be coo-coo to believe that story.”
Someone might describe a chaotic situation as, “It’s coo-coo in here. Everyone is running around like crazy!”

43. Daft as a brush

Daft as a brush is a humorous phrase used to describe someone who is extremely foolish or silly. It implies a lack of intelligence or common sense.

For example, “He’s as daft as a brush. He always makes the silliest mistakes.”
A person might say, “Don’t listen to him, he’s daft as a brush.”
Someone might use the phrase to describe a funny or ridiculous situation, “The whole situation was daft as a brush. We couldn’t stop laughing!”

44. Madcap

Madcap refers to someone or something that is wildly impulsive or reckless in a playful or adventurous way. It suggests a disregard for conventional behavior or norms.

For instance, “She’s a madcap adventurer, always seeking new thrills.”
A person might describe a spontaneous road trip as, “It was a madcap adventure. We had no plan and just went wherever the road took us.”
Someone might say, “That movie is a madcap comedy filled with hilarious and unpredictable moments!”

45. Unbalanced

Unbalanced is a term used to describe someone who is mentally unstable or emotionally disturbed. It implies a lack of emotional stability or mental well-being.

For example, “He’s been acting unbalanced lately. I’m worried about his mental health.”
A person might say, “Her behavior is unbalanced. She goes from extreme happiness to deep sadness within minutes.”
Someone might describe a person’s thoughts or ideas as unbalanced, “His theories are completely unbalanced and lack logical reasoning.”

46. Touched in the head

This phrase is used to describe someone who is mentally unstable or crazy. It implies that there is something wrong with their mental faculties.

For example, “He’s a bit touched in the head, always talking to himself.”
A person might say, “I think she’s a little touched in the head for believing in conspiracy theories.”
Another might comment, “Only someone touched in the head would jump off a moving train.”

47. Daffy

This term is used to describe someone who is crazy or eccentric. It suggests that their behavior or actions are unusual or irrational.

For instance, “He’s a bit daffy, always wearing mismatched socks.”
A person might say, “She’s daffy for thinking she can fly without wings.”
Another might comment, “Only a daffy person would collect rubber ducks as a hobby.”

48. Doo-lally

This slang term is used to describe someone who is insane or mad. It originated from the phrase “to go doolally tap,” which refers to someone losing their mind.

For example, “He went doo-lally after losing his job.”
A person might say, “She’s completely doo-lally, talking to imaginary friends.”
Another might comment, “Only a doo-lally person would believe in conspiracy theories.”

49. Round the bend

This phrase is used to describe someone who is crazy or insane. It suggests that the person’s mental state has deteriorated to the point of irrationality.

For instance, “He’s gone round the bend, talking to plants.”
A person might say, “She’s completely round the bend, believing in supernatural creatures.”
Another might comment, “Only someone round the bend would quit their stable job to become a professional clown.”