Language is a vibrant tapestry woven with idioms that color our expressions. Today, we embark on a whimsical journey through idioms, specifically those describing someone’s behavior as a bit, well, crazy.
From being “out of one’s mind” to being “totally flipped,” we’ll unravel the meanings behind these quirky phrases that add a dash of insanity to our everyday conversations.

Idioms for Crazy
1. “Out of one’s mind”
Meaning: Someone is acting in a way that is not rational or sane. In a Sentence: After staying up for 48 hours straight, he was completely out of his mind during the business presentation.
2. “Off the rails”
Meaning: Someone is behaving in a way that is unexpected or irrational. In a Sentence: The meeting went off the rails when everyone started arguing about the budget.
3. “Not playing with a full deck”
Meaning: Someone is not of sound mind or is mentally impaired. In a Sentence: It became evident during the exam that he wasn’t playing with a full deck when he couldn’t answer the simplest questions.
4. “Loose cannon”
Meaning: Someone is unpredictable and can cause harm to themselves or others. In a Sentence: Dealing with him is like handling a loose cannon – you never know what he’ll do next.
5. “Lost their marbles”
Meaning: Someone is acting in a way that is irrational or crazy. In a Sentence: She completely lost her marbles when she found out her car had been towed.
6. “Off their rocker”
Meaning: Someone is behaving in a way that is unexpected or irrational. In a Sentence: His decision to quit his stable job and become a street musician left everyone thinking he was off his rocker.
7. “Out of their gourd”
Meaning: Someone is acting in a way that is not rational or sane. In a Sentence: After the breakup, he was out of his gourd, doing things no one expected.
8. “Batty”
Meaning: Someone is acting in a way that is not rational or sane. In a Sentence: Aunt Mabel is a bit batty – she talks to her plants as if they’re her best friends.
9. “Buggy”
Meaning: Someone is acting in a way that is not rational or sane. In a Sentence: Ever since the incident, he’s been acting buggy, constantly checking his surroundings.
10. “Cuckoo”
Meaning: Someone is acting in a way that is not rational or sane. In a Sentence: The professor’s theory sounded a bit cuckoo, but some students found it intriguing.
11. “Gone mad”
Meaning: Someone is acting in a way that is not rational or sane. In a Sentence: The stress of the project deadline made him feel like he was gone mad, working day and night.
12. “Insane”
Meaning: Someone is acting in a way that is not rational or sane. In a Sentence: The daredevil’s stunt on the skyscraper’s edge was nothing short of insane.
13. “Mental”
Meaning: Someone is acting in a way that is not rational or sane. In a Sentence: The pressure at work was making her go mental, and she needed a break.
14. “Nuts”
Meaning: Someone is acting in a way that is not rational or sane. In a Sentence: The news of winning the lottery left him nuts with excitement.
15. “Psycho”
Meaning: Someone is acting in a way that is not rational or sane. In a Sentence: The thriller movie had a plot twist where the seemingly normal character turned out to be psycho.
16. “Round the bend”
Meaning: Someone is acting in a way that is not rational or sane. In a Sentence: His obsession with collecting rare coins had everyone thinking he was round the bend.
17. “Out of their minds”
Meaning: Someone is acting in a way that is not rational or sane. In a Sentence: The teenagers’ loud music and laughter had the neighbors thinking they were out of their minds.
18. “Crazy as a loon”
Meaning: Someone is acting in a way that is not rational or sane. In a Sentence: After the prank, she laughed so hard that people thought she was crazy as a loon.
19. “Out to lunch”
Meaning: Someone is not paying attention or not thinking clearly. In a Sentence: During the important meeting, he seemed out to lunch, doodling on his notepad.
20. “Barking mad”
Meaning: Someone is acting in a way that is not rational or sane. In a Sentence: The proposal to build a rollercoaster in the office was downright barking mad.
21. “Hooked on a feeling”
Meaning: Someone is feeling very strongly about something, often to the point of obsession. In a Sentence: She was hooked on a feeling that her favorite sports team would win the championship.
22. “In a daze”
Meaning: Someone is in a state of confusion or disorientation. In a Sentence: After the accident, he walked around in a daze, unable to process what had happened.
23. “Out of their element”
Meaning: Someone is behaving in a way that is unexpected or out of character. In a Sentence: At the costume party, he felt out of his element dressed as a superhero among wizards and fairies.
24. “Unhinged”
Meaning: Someone is acting in a way that is not rational or sane. In a Sentence: The constant stress of the job had him feeling unhinged, snapping at colleagues for no reason.
25. “High as a kite”
Meaning: Someone is under the influence of drugs or alcohol, and not thinking clearly. In a Sentence: It was evident he was high as a kite when he started laughing uncontrollably at the mundane.
26. “In a fog”
Meaning: Someone is in a state of confusion or disorientation. In a Sentence: After the breakup, she walked around in a fog, unable to focus on anything.
27. “In a spin”
Meaning: Someone is feeling overwhelmed or stressed. In a Sentence: With exams approaching, the students were in a spin, trying to cram months of material into a few days.
28. “Whacked”
Meaning: Someone is acting in a way that is not rational or sane. In a Sentence: The sleep-deprived programmer’s code was so whacked that it took hours to fix.
29. “Flipped out”
Meaning: Someone is acting in a way that is not rational or sane. In a Sentence: When the cat knocked over the expensive vase, she completely flipped out, yelling and waving her arms.
30. “Totally flipped”
Meaning: Someone is acting in a way that is not rational or sane. In a Sentence: After the haunted house experience, she was totally flipped, seeing ghosts in every shadow.
Summary
| Idiom | Meaning |
|---|---|
| Out of one’s mind | Acting irrationally or not in a sound state of mind |
| Off the rails | Behaving unexpectedly or irrationally |
| Not playing with a full deck | Not of sound mind or mentally impaired |
| Loose cannon | Unpredictable and potentially harmful |
| Lost their marbles | Acting in an irrational or crazy manner |
| Off their rocker | Behaving unexpectedly or irrationally |
| Out of their gourd | Acting in a way that is not rational or sane |
| Batty | Acting in a way that is not rational or sane |
| Buggy | Acting in a way that is not rational or sane |
| Cuckoo | Acting in a way that is not rational or sane |
| Gone mad | Acting in a way that is not rational or sane |
| Insane | Acting in a way that is not rational or sane |
| Mental | Acting in a way that is not rational or sane |
| Nuts | Acting in a way that is not rational or sane |
| Psycho | Acting in a way that is not rational or sane |
| Round the bend | Acting in a way that is not rational or sane |
| Out of their minds | Acting in a way that is not rational or sane |
| Crazy as a loon | Acting in a way that is not rational or sane |
| Out to lunch | Not paying attention or not thinking clearly |
| Barking mad | Acting in a way that is not rational or sane |
| Hooked on a feeling | Feeling very strongly about something, often to the point of obsession |
| In a daze | In a state of confusion or disorientation |
| Out of their element | Behaving unexpectedly or out of character |
| Unhinged | Acting in a way that is not rational or sane |
| High as a kite | Under the influence of drugs or alcohol, not thinking clearly |
| In a fog | In a state of confusion or disorientation |
| In a spin | Feeling overwhelmed or stressed |
| Whacked | Acting in a way that is not rational or sane |
| Flipped out | Acting in a way that is not rational or sane |
| Totally flipped | Acting in a way that is not rational or sane |
Conclusion
As we conclude our linguistic odyssey into the realm of idioms for the whimsically crazy, it’s evident that language serves as a canvas where expressions paint vibrant pictures of human experiences. These idioms, although seemingly offbeat, encapsulate the diversity of emotions, from the hilariously absurd to the poignantly overwhelming.