1) The word fruitcake has come to mean someone who is round the bend, out to lunch, completely fucking mad. It came from the old British slang"Nutty as a fruitcake"(fruitcakes have got nuts in, ya see), because, as you know we've used the slang term "Nutters" for the insane for....well ever, really.

2) I do believe that some American people call gay people fruitcakes. I know that the term "fruit" has been used as a slightly derogatory term for Gay men(in the UK any way), but I'm really not sure where the "cakes" bit came from, or why!.
1) "Dave came round the other day, goin' on about these multidimensional life forms that are controlling his libido or somethin'" "Oh yeah, Dave's a total Fruitcake dude."

2)....Err not sure really!! I've never heard "fruitcake" used in this context. But "Fruit":

Err 2, take 2) "Look at John mincing about,......Oi John your a proper fruit mate"
by HungryGhost March 21, 2015

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a name given to a kid typically (george liu)
george was dicking around so his friends called him a fruitcake

george fruitcake scrub frail frutti puffy
by antwon thgirwtrac February 11, 2013

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A fat chick's nasty fat ass. The ungucci version of a cake
"Yo, Kim Kardashian has a cake, but Oprah's got dat fruitcake!"
by blazingbizzy December 23, 2011

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A straight woman who hangs out with lesbians.
Dude, Chelsea is such a fruitcake. She's always kicking it with the lesbians, but her boyfriend is hella fine.
by Rae1138 December 14, 2011

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a fruitcake is someone that is either homosexual or acts oddly on a daily basis
Kyle, you are a fruitcake. You jump around all day like a tard.
by imafruitcake January 06, 2011

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Fruitcakes, which are cakes containing both fruit and nuts, have been in existence since the Middle Ages, but it is unclear when the term started being used disparagingly, especially in the United Kingdom and the United States, as a slur for a 'crazy person' (e.g. "he's a complete fruitcake")
He's a complete fruitcake
by Prime8 August 11, 2015

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A lesbian's pussy.
"You know you're trying to score with a fruit cake, right?"
"No way."
"Yeah, she told me earlier."
by Oneironauts March 07, 2014

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