{adj. phr.}, {slang} Very crazy; entirely mad. * /He looked all right, as we watched him approach, but when he began to talk, we saw that he was as nutty as a fruitcake./
NUTTY AS A FRUITCAKE
Meaning of NUTTY AS A FRUITCAKE in English
Dictionary of English idioms . Словарь английских идиом. 2012