Cockpedo

A guy who is a solid friend and will stick by your side unless there is even the slightest, most remote chance he will score with a chick and then he homes on the chick like a torpedo after a target. He's unstoppable and will ditch all his friends for even the slightest chance of getting laid. Expect to get ditched for the big game, ditched when he's supposed to give you a ride to get new kicks at the mall or help fixing your car.

I really like Derek but he's a total cockpedo, even tried to bang my ex-girlfriend when he was supposed to be my best man.