A playfully exaggerated term for someone who is acting wildly irrational, unpredictably unhinged, or just spectacularly eccentric — either as a noun (that person is a total crazypants) or as an adjective (that idea is completely crazypants). The '-pants' suffix is a classic English comedy construction that softens and cartoonifies whatever word it's attached to, making the insult more affectionate than hostile. You'd call someone a crazypants with a grin, not a grimace. Common in informal American speech and online culture.
My cat decided it was the perfect time to sprint laps at 3 AM — absolute crazypants behavior.
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(slang) Crazy.
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(slang) A crazy person.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.