Top 28 Slang For Crazy Person – Meaning & Usage

Have you ever come across someone who is just a little off their rocker? We all know that one person who is a bit eccentric, unpredictable, or downright wacky. Well, we’ve got you covered with our list of the top slang terms for a crazy person. So, buckle up and get ready to explore the colorful world of these unique individuals. Trust us, you won’t be disappointed!

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1. Loony

This term is used to describe someone who is mentally unstable or behaves in an irrational or unpredictable manner.

  • For example, “He’s a complete loony, talking to himself and wearing mismatched socks.”
  • In a discussion about strange behavior, someone might say, “I saw this loony guy dancing in the middle of the street.”
  • Another might comment, “She’s a bit of a loony, always coming up with wild conspiracy theories.”

2. Nutcase

This slang term is used to describe someone who is mentally unstable or exhibits eccentric or irrational behavior.

  • For instance, “Stay away from that guy, he’s a total nutcase.”
  • In a conversation about unusual habits, someone might say, “I work with this nutcase who eats ketchup on everything.”
  • Another might comment, “She’s a nutcase, always changing her hair color and style.”

3. Wacko

This slang term is used to describe someone who is mentally unstable or acts in a bizarre or irrational manner.

  • For example, “Did you hear about that wacko who believes in aliens living among us?”
  • In a discussion about strange occurrences, someone might say, “I had a wacko neighbor who used to collect garden gnomes.”
  • Another might comment, “She’s a bit of a wacko, always wearing mismatched shoes.”

4. Psycho

This slang term is used to describe someone who is mentally unstable or exhibits violent or erratic behavior.

  • For instance, “Watch out for that guy, he’s a total psycho.”
  • In a conversation about dangerous individuals, someone might say, “I heard about this psycho who went on a stabbing spree.”
  • Another might comment, “She’s a psycho, always threatening people and causing trouble.”

5. Cuckoo

This term is used to describe someone who is mentally unstable or acts in a foolish or eccentric manner.

  • For example, “She’s gone completely cuckoo, talking to imaginary friends.”
  • In a discussion about odd behavior, someone might say, “My coworker is a bit cuckoo, always wearing mismatched socks.”
  • Another might comment, “He’s a real cuckoo, always coming up with bizarre ideas.”

6. Madman

This term is used to describe someone who is mentally unstable or exhibits irrational behavior. It is often used in a derogatory or exaggerated manner to emphasize someone’s eccentricity or unpredictability.

  • For example, “He went mad and started throwing things around the room.”
  • In a discussion about a person’s erratic behavior, one might say, “He’s a complete madman, you never know what he’ll do next.”
  • Another usage could be, “She’s a creative genius, some might call her a madman in the art world.”

7. Lunatic

A derogatory term used to describe someone who is mentally unstable or behaves in an irrational or unpredictable manner. It is often used to exaggerate someone’s level of craziness or to dismiss their behavior as irrational.

  • For instance, “He’s acting like a complete lunatic, shouting and screaming.”
  • In a conversation about someone’s bizarre actions, one might say, “She’s a real lunatic, always doing things that make no sense.”
  • Another usage could be, “Don’t mind him, he’s just a lunatic who enjoys pushing people’s buttons.”

8. Bonkers

This term is used to describe something or someone as extremely crazy, irrational, or nonsensical. It is often used in a lighthearted or playful manner to convey a sense of disbelief or amusement.

  • For example, “That idea is absolutely bonkers, it’ll never work.”
  • In a discussion about a person’s wild behavior, one might say, “He’s gone completely bonkers, dancing on the tables.”
  • Another usage could be, “The party last night was bonkers, people were doing all sorts of crazy things.”

9. Nutter

This term is used to describe someone who is mentally unstable or exhibits eccentric behavior. It is often used in a derogatory manner to dismiss someone’s ideas or actions as irrational or nonsensical.

  • For instance, “He’s a real nutter, always coming up with bizarre conspiracy theories.”
  • In a conversation about someone’s unusual habits, one might say, “She’s a bit of a nutter, collecting weird stuff.”
  • Another usage could be, “Don’t listen to him, he’s just a nutter who likes to stir up trouble.”

10. Whackjob

This term is used to describe someone who is mentally unstable or exhibits bizarre behavior. It is often used in an informal or colloquial manner to emphasize someone’s craziness or eccentricity.

  • For example, “He’s a total whackjob, always talking to imaginary friends.”
  • In a discussion about a person’s unusual habits, one might say, “She’s a bit of a whackjob, always wearing mismatched socks.”
  • Another usage could be, “I don’t trust him, he’s a whackjob who believes in aliens.”

11. Crazed

This term is used to describe someone who is mentally unstable or out of control. It implies a state of extreme agitation or irrational behavior.

  • For example, “The crazed man was shouting and running through the streets.”
  • In a news report, it might say, “The suspect was described as a crazed individual with a history of violent behavior.”
  • A person might use this term to describe someone’s actions, saying, “He went crazed and started smashing everything in sight.”

12. Loon

This slang term is used to describe someone who is considered crazy or mentally unstable. It is often used in a lighthearted or humorous manner.

  • For instance, “She’s a total loon, always coming up with the wildest ideas.”
  • In a conversation about eccentric individuals, someone might say, “Have you met that new neighbor? He’s a real loon.”
  • A person might jokingly refer to themselves as a loon, saying, “I must be a loon to try that crazy stunt.”

13. Nutty

This term is used to describe someone who is mentally unstable or eccentric. It implies a sense of irrationality or unpredictability.

  • For example, “He’s a bit nutty, always talking to imaginary friends.”
  • In a discussion about unusual behavior, someone might say, “I’ve seen some nutty things in my time, but that takes the cake.”
  • A person might use this term to describe their own actions, saying, “I went a bit nutty and dyed my hair bright pink.”

14. Demented

This term is used to describe someone who is mentally deranged or suffering from a severe mental illness. It implies a state of madness or irrationality.

  • For instance, “The demented killer showed no remorse for his actions.”
  • In a conversation about disturbing behavior, someone might say, “That’s the work of a truly demented mind.”
  • A person might use this term to describe someone’s actions, saying, “He went demented and started smashing everything in sight.”

15. Whacko

This slang term is used to describe someone who is considered crazy or mentally unstable. It implies a sense of oddity or eccentricity.

  • For example, “He’s a total whacko, always coming up with bizarre theories.”
  • In a conversation about unusual individuals, someone might say, “That guy is a real whacko, you never know what he’ll do next.”
  • A person might jokingly refer to themselves as a whacko, saying, “I must be a whacko to try that insane challenge.”

16. Cray-cray

This slang term is used to describe someone who is extremely or excessively crazy. It is a playful and informal way to refer to someone who exhibits bizarre or irrational behavior.

  • For example, “She went cray-cray when she saw a spider in her room.”
  • A person might say, “I can’t believe how cray-cray that party was last night.”
  • Another might comment, “He’s acting cray-cray lately, I wonder what’s going on with him.”

17. Fruit loop

This slang term is used to describe someone who is mentally unstable or insane. It is often used in a lighthearted or humorous manner to refer to someone who behaves in an eccentric or irrational way.

  • For instance, “He’s a total fruit loop, always coming up with wild ideas.”
  • A person might say, “I feel like I’m going fruit loop trying to juggle work and personal life.”
  • Another might comment, “She’s gone fruit loop ever since she started her new job.”

18. Loony tunes

This slang term is used to describe someone who is crazy or mentally unstable. It is derived from the animated series “Looney Tunes” which features characters with exaggerated and unpredictable behavior.

  • For example, “He’s acting like a loony tunes, talking to himself and laughing for no reason.”
  • A person might say, “The whole situation was just loony tunes, I couldn’t believe what I was witnessing.”
  • Another might comment, “She’s gone loony tunes ever since her breakup.”

19. Mad as a hatter

This slang term is used to describe someone who is completely crazy or mentally unstable. It originated from the phrase “mad as a hatter” which refers to the erratic behavior exhibited by hat makers due to mercury poisoning in the past.

  • For instance, “He’s mad as a hatter, always talking to imaginary people.”
  • A person might say, “The way she reacted was mad as a hatter, completely unpredictable.”
  • Another might comment, “I thought he was mad as a hatter when he told me his conspiracy theories.”

20. Nutter butter

This slang term is used to refer to someone who is crazy or mentally unstable. It is a playful and informal way to describe someone who exhibits eccentric or irrational behavior.

  • For example, “He’s a total nutter butter, always coming up with outrageous ideas.”
  • A person might say, “I can’t believe the things she says, she’s a real nutter butter.”
  • Another might comment, “He’s acting like a nutter butter lately, I wonder what’s going on with him.”

21. Nutso

An informal term used to describe someone who is mentally unstable or irrational. “Nutso” is often used to convey a sense of extreme craziness or madness.

  • For example, someone might say, “He went completely nutso and started screaming at everyone.”
  • In a discussion about erratic behavior, one might comment, “That guy’s actions were totally nutso.”
  • A friend might jokingly say, “You’re driving me nutso with your wild ideas!”

22. Wackadoodle

A playful term used to describe someone who is extremely eccentric or crazy. “Wackadoodle” implies a level of quirkiness or odd behavior that is beyond the norm.

  • For instance, a person might say, “She’s a bit of a wackadoodle, but she’s fun to be around.”
  • In a conversation about unique individuals, someone might comment, “I’ve never met anyone as wackadoodle as him.”
  • A friend might affectionately tease, “You’re such a wackadoodle sometimes!”

23. Bats

A slang term used to describe someone who is mentally unstable or crazy. “Bats” is a shortened form of “bats in the belfry,” which refers to the idea of someone having bats flying around in their head, representing madness or irrationality.

  • For example, one might say, “He’s gone completely bats and can’t make any rational decisions.”
  • In a discussion about mental health, someone might comment, “It’s important to seek help if you feel like you’re going bats.”
  • A person might jokingly say to a friend, “You’re bats, but that’s why I love you!”

24. Batshit crazy

A vulgar slang term used to describe someone who is extremely crazy or mentally unstable. “Batshit crazy” implies a level of madness or irrationality that is beyond normal comprehension.

  • For instance, someone might say, “She went batshit crazy after losing her job.”
  • In a conversation about outrageous behavior, one might comment, “That’s the most batshit crazy thing I’ve ever heard.”
  • A friend might jokingly say, “You’re driving me batshit crazy with your antics!”

25. Cuckoo for Cocoa Puffs

A humorous phrase used to describe someone who is crazy or obsessed with something. “Cuckoo for Cocoa Puffs” references a popular cereal brand and suggests a level of irrationality or extreme enthusiasm.

  • For example, someone might say, “He’s absolutely cuckoo for Cocoa Puffs when it comes to collecting comic books.”
  • In a discussion about hobbies, one might comment, “I’m a little cuckoo for Cocoa Puffs when it comes to gardening.”
  • A friend might playfully tease, “You’re cuckoo for Cocoa Puffs about that new band!”

26. Nutty as a fruitcake

This phrase is used to describe someone who is very mentally unstable or eccentric. It implies that the person’s behavior or thoughts are irrational and nonsensical.

  • For example, “She’s as nutty as a fruitcake, always talking to imaginary friends.”
  • Someone might say, “I can’t believe he believes in conspiracy theories. He’s nutty as a fruitcake.”
  • Another person might comment, “Her fashion choices are so wild, she’s cuckoo-bananas.”

27. Cuckoo-bananas

This slang term is used to describe someone who is completely crazy or insane. It emphasizes the absurdity or irrationality of the person’s behavior or thoughts.

  • For instance, “He went cuckoo-bananas when he found out he lost his job.”
  • A person might say, “The party last night was wild. Everyone was going cuckoo-bananas.”
  • Another example could be, “Her ideas are so outlandish, she’s absolutely cuckoo-bananas.”

28. Psycho-bunny

This term is used to describe someone who exhibits both crazy and unpredictable behavior. It combines the words “psycho,” meaning mentally unstable, and “bunny,” which adds a playful or cute element to the description.

  • For example, “Watch out for her, she’s a real psycho-bunny.”
  • A person might say, “He’s acting like a psycho-bunny, you never know what he’s going to do next.”
  • Another example could be, “That horror movie was full of psycho-bunnies, it was so intense.”
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