One who rides a cock like a jockey rides a horse. Usually used between teenage males to signify being a dick, a dumbass,or to let someone know that they're acting faggy.
Man, that Joe is a real cock jockey! I asked him if a could borrow five bucks and he called me a douche and walked off. Must be that time of the month!
or
Did you see Caitlin today? What a cock jockey! I wouldn't mind puttin' one through her!
A person that sucks cock like it's an Olympic sport. Often found in the locker rooms naked and slapping other men's asses with towels. Sucks for free but if you pay they might let you ram them.