A sweaty, effeminate, bearded uncle who dances too much at family weddings and remains a bachelor his whole life. Has a reputation among his immediate family as a "bit of a fruit" and profanes female celebrities when drunk.
eg. "That Carol fucking Vordermann has had a face-lift. Dirty tart."
Son: Mummy, why is Unky Jeremy doing the can-can with that waiter?
Mother: Oh you know your Uncle Jeremy. He always was a bit of a Sir Prancealot.