n. a silly-acting person. (Also a term of address.) : You can be such a silly fruitcake sometimes.
n. a male homosexual. (Rude and derogatory. An elaboration of fruit.) : We went into this bar, but it was filled with fruitcakes, so we left.
n. and fruit loop. a foolish oaf. (Someone who is as nutty as a fruitcake. Fruit loop is borrowed from the cereal of the same [protected trade] name.) : What a fruitcake! Doesn't even know where his head is at. , Out of the way, fruit loop.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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[froot-keyk] 
