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3. be (as) nutty as a fruitcake

be (as) nutty as a fruitcake

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be (as) nutty as a fruitcake

slang To be crazy and/or wacky. Usually used humorously. Don't listen to a word he says, he's as nutty as a fruitcake! You're nutty as a fruitcake if you think that plan will work.

See also: fruitcake, nutty