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Crazy; very eccentric; bughouse, meshuga: Are you nuts to turn your back on a deal that could mean life or death?/ Heir Rejected 400G, Is He Nuts? ( first form 1914+, second 1932+)
An exclamation of disbelief, defiance, contempt, dismay, etc: General McAuliffe replied ''Nuts!'' to the Germans at Bastogne (1931+)
bust one's ass, the cat's meow, get one's nuts, hot rocks, numb-nuts