nutter
1. offensive slang A derogatory term for someone who is insane or psychotic. Some nutter went rambling through the mall this morning, screaming incomprehensibly at anyone who went near him. My step-father threatened to have me locked away with the other nutters.
2. slang An eccentric, wild, or wacky person. My friend Jake is a total nutter, always pulling the most insane and reckless stunts. My whole family thinks I'm a bit of a nutter because I practice holistic medicine.
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