be (as) nutty as a fruitcake
US /bi əz ˈnʌt.i əz ə ˈfruːt.keɪk/
UK /bi əz ˈnʌt.i əz ə ˈfruːt.keɪk/

1.
瘋瘋癲癲的, 古怪的
to be crazy or eccentric
:
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My aunt is as nutty as a fruitcake, but we love her.
我姑姑瘋瘋癲癲的,但我們愛她。
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You'd have to be as nutty as a fruitcake to believe that story.
你肯定瘋了才會相信那個故事。