cock blocking is when guy 1 approaches a girl he is interested in, and suddenly guy 2 appears and the proceeds to talk to the girl that guy one was already talking with. he may then ask guy 1 about the rash on his dick, or how his gf is or something. Basically blocking the guys attempt at poon
"I'm a dog chasing cars. I wouldn't know what to do if I caught one. I just *do* things. I'm a wrench in the gears. I *hate* plans." - The Joker http://pressthenyckbutton.blogspot.com/