a bitch ass, usually a friend, who keeps u from gettin wit a girl either cuz hes: stupid, jealous or both
Me: hey look at stephan and jazmine over there.
Edward: yeah u think theyre gonna hook up?
Me: yeah man it looks that... oh wait theres Tim heading for them
Edward: What should we do??
Me: Lets try to get to Tim before he gets to stephan! Oh man its too late
Edward: What a cock blocker
Me: yup. Moment of silence for our fallen brother.