i Register
In some senses, fruitcake is marked as derogatory, dated, slang, colloquial, US. Watch for register when choosing this word.
noun
A cake containing dried fruits and, optionally, nuts, citrus peel and spice; usually served in celebration of weddings and Christmas.
A crazy or eccentric person.
Easy, feller, easy. She's a fruitcake.
One of the loafers kept calling down, "Hey you, Blondie, you like fruitcake kids like that?"
A homosexual male.