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.
완전히 미치다, 괴짜이다
to be crazy or eccentric
:
•
My aunt is as nutty as a fruitcake, but we love her.
우리 이모는 완전히 미쳤지만, 우리는 그녀를 사랑해.
•
You'd have to be as nutty as a fruitcake to believe that story.
그 이야기를 믿으려면 완전히 미쳐야 할 거야.