fruitcake

noun3

1. •
   A cake containing dried fruits and, optionally, nuts, citrus peel and spice; usually served in celebration of weddings and Christmas.
2. •
   (informal, offensive) A crazy or eccentric person.

   • Easy, feller, easy. She's a fruitcake. — 1952
3. •
   (slang, offensive) A homosexual male.