A British slang term for someone who is crazy, eccentric, or acts in a wild or unreasonable way.
Derived from 'nut,' which became British slang for 'head' or 'mind' in the 19th century. The '-er' suffix creates an agent noun, literally meaning 'one whose nut (head) doesn't work right.'
British slang is packed with these creative insults using body parts—'nutter,' 'bampot' (head), 'loon'—and they reveal how speakers playfully associate different body parts with mental function. It's much gentler and more affectionate than it sounds, often used for lovable eccentrics!
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