Cock Block:
The action of preventing a male from scoring on a female.
Example:
Hypothetically, at a bar mitzvah, a boy named Ryan and his SO, Harley, are making out. Harley's friend Remy was driving her home. While they were hooking up, Remy lies about them having to leave. This is preventing Ryan from going further, thus a cockblock. In this situation, Remy is a cock blocker, and the action where she cock blocked, was tricking Harley to stop.
Aidan- "Did Ryan get with Harley?"
Graham- "No, Remy cockblocked."
Aidan- "She is such a cock block."
A person that comes between you and your boyfriend/girlfriend
I kept tryna talk to my girl but Maria kept being a cock block
When you kill an individual by putting your cock down their throat and block the air way, while covering the nostrils with your nut-sack
Friend 1- How did John finally get rid of that bitchy girlfriend?
Friend 2- I heard he Cock Blocked her
The friend that you have nothing in common with, but you seem to wind up hanging out anyways. Often interested in space, fantasy games and gaining weight. Forms an impenetrable barrier between you and good looking women.
Wanna hang out with Sam?
That dude is the biggest cock block. Hell no.
A cock block is a place is the imagination where all people other than your spouse have forgotten about your cock for a second.
I've got another cock block coming in 5,4,3,2,1....
the partition between two urinals in a pulic restroom
Man, it's a good thing there was a cock block in the men's room at the San Francisco airport. I didn't want any guy checking out my junk.