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A crazy or mentally ill person.
The secretary was a fruitcake, but for some reason people, including the lawyer she was in a relationship with, still paid her undue attention.
A silly person, someone who just doesn't make any sense in what they are trying to say or do.
Man, Daniel is such a fruitcake. He's always doing the weirdest things.
“Fruitcake” is used to describe a person who is annoying or blindingly arrogant
Did you see James showing off his new phone, what a fruitcake