What it means
A nutcase is someone who's properly bonkers, reckless, or running on chaos with trainers on. You'd use it for the person doing something daft, unhinged, or weirdly bold enough to make everyone stop and stare. It can be a straight insult, but with mates it's often half affectionate when someone's being stupid, fearless, and a bit iconic with it.
Usage examples
"Jess rocked up to the charity do dressed as a traffic cone, then still did the bungee. Proper nutcase, but fair play, she raised two grand."
"My mate's a total nutcase, he jumped in the lake in January just because someone dared him."
"Driving like that in the fog, the man's an absolute nutcase, I had my eyes shut half the way."
"You let Dave loose with fireworks and a shopping trolley and now he's in A&E. Absolute nutcase."
"She's a lovely girl, just a bit of a nutcase after two vodkas and a dare."
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Where it comes from
Nut had been slang for the head since the 19th century, so nutcase grew naturally out of that, with case tagging someone as a type of person. By the 20th century it was firmly used in British and wider English for someone seen as crazy, then later loosened up in everyday banter into playful abuse too.
Other ways to say it
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