What is Cock-blocking?
1.
When a guy or a friend tries to get with a girl your talking to, hence, "Cock-blocking". Keeping you from getting a piece of ass.
"Dont be cock-blocking me from my girl you fag!"
2.
Trying to get on someone's business; like when someone's trying to hook up, or engaged in a sexual activity.
Eric: So can I get your # then, shorty?
Shonna: Eric, I thought you said you didn't like black girls.
Raven: Really? fucking racist bitch!
Eric: Why you always cock-blocking, fucking annoying son!
See
3.
When a friend of yours calls you while you are about to get it on, or when someone comes in while you and your partner are about to have intercourse and keeps you from it by talking, making noise, etc.
Dude, don't call me. Stop cock-blocking!
See
4.
An act wherin a kind soul will hit on a chick who has been stalking his friend so that the friend may pursue intimate relations with a hotter chick.
Dude, that guy was cock blocking Christine when you were trying to get with Lisa. You definently owe him one man.
5.
To Spit Game at a selected girl,that already has a man. (Men)
Basically the main goal of the man "Spitting" is to make the girl like him more than the other guy, hence:
"Cock-Blocking".
See