Can be ruined for one or both parties.
Best described with an example.
Andrew: Then I'll take off your shirt and your bra and bite your neck and pull your hair
Haley: I'll take off your shirt and your pants and get on top of you and start biting your neck softly
Andrew: Then I'll move down to your stomach and take your panties off and I'll start to eat out your pussy
Haley: Next I'll take your boxers off and kiss your dick, I'll get on my knees and start sucking your cock
Andrew: Mmmmmm, Baby, what's next?
Haley: I think that's up to you;)
Andrew: I want you to suck me until I'm rock hard and about to explode. Then I'll get on top of you and pin you to the bed and start to put rock hard cock in your tight, wet....
James: Hey man, what's up?
Andrew: You fucking cock block!!!
James: Who are you talking to?
Andrew: Haley!!! We were having a good time!!
Haley: Tell you're brother he fucking ruined it!!!
James: YOU'RE WELCOME
Andrew: Get out James!!! Baby, I'm not horny anymore. I'm sorry my brother's a fucking cock block.
Haley: Ugh, neither am I. Tell him that I'm fucking pissed at him.
2. Any such attempt to prevent a male friend or associate from getting some action.
2. OK, Isaac's making his move on Clarisse in the living room, and the game is on in fifteen minutes. We're going to have to attempt a cockblock.
2.) A motor vehicle maneuver, usually done by insecure twenty-something males (who think that everybody wants to race them) and other ignorant people, designed to prevent someone from changing lanes in traffic
2.) I realized that my exit was coming up so I began to change lanes, but that ricer cock-blocked me
3.) The traffic on the highway was hell, mostly because of that soccer mom driving the minivan in the far left lane, pacing and matching speeds with the semi in the middle lane. She cock-blocked us all.
2.A situation that obstructs; an obstacle
3.An act of ill etiquette in which a male is speaking to one female in a group of females, and the alpha female creates a disruptive environment.
(v.) any action that impedes or stalls another's "game", "mack", or "pimp manuver"
(v.) I had finally convinced Susan to go to my friend's keg party with me, when my Dad cock-blocked me by taking away my car keys.
2. abbr. Cockblocker(n.)