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nutty as a fruitcake
*nutty as a fruitcake
and nuttier than a fruitcakecrazy. (*Also: as ~.) Don't pay any attention to John; he's nutty as a fruitcake. Mary's schemes for making money are nuttier than a fruitcake.
(as) nutty as a fruitcake
crazy She's as nutty as a fruitcake.
nutty as a fruitcake
Crazy, idiotic, as in Mary's nutty as a fruitcake if she thinks she can get away with that. The adjective nutty meaning "insane" was first recorded in 1821; the similarity to fruitcake, which literally contains nuts as well as fruit, was first recorded in 1935.
nutty as a fruitcake
verb