(could be referred to homosexuals also)
2. I was about to take her home, and then you had to make the remark about the old cheeseburger under the seat in my car, you damn cockblocker!
(block) somebody from spittin game, getting someones number,or hooking up.
A.K.A. an annoying ass friend
2.) you might be in a bedroom with a girl about to get a piece and then all of the sudden, your buddy starts banging away at the door for no reason. He just wants to figure out a way for it be as hard as possible for you to get some. That's a cock blocker
examples courtesy of TwanDiggity