Cock blocking is when a man is interested in having sexual relations with a female and is interrupted by a 3rd party making the chances of him having sexual intercourse with female much harder.
Kristen is cock blocking
by TT203 December 04, 2011
Blocking a Male Chicken from reaching it's destination, resulting in the call "Cock Block!"
COCK BLOCK!
by rdpunk February 06, 2011
When a guy who is trying to get laid doesn't because another dude says or does something to prevent that from happening. Can also occur between women (also known as twat swatting).
A man's dumbass friend spots him trying to make a move on the hot blonde girl at the bar and decides to be a real dick and cockblock his mate.....

Man: Hey let me buy you drink....
Woman: Yeah sure
Dumbass: Hey man, how's your AIDS? *walks away*
Man:.........fuck.
by P. Trotsky January 25, 2011
A douche bag who purposely ruins a moment.
During science my class cock blocked john and me. </3
by for Borjy. September 28, 2010
When you're about to score but someone ruins it for you.
Can be ruined for one or both parties.
Mood killer.
Best described with an example.
Haley and her boyfriend Andrew were having phone sex when Andrew's brother James walked in.

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.
by LoveLoveLove27 July 06, 2010
1. Originally applied to males. Any act blocking the pursuits of another through alphamale/dominant/dickish behavior.

Originally observed and defined in Moore Hall, 4th Floor, College Station Texas while watching a porn. A male actor was lining up his approach on a female actress in doggy style scene when Peter North pushed the lesser known actor out of the way and took "pole" position for himself. Henceforth this was known as the "cockblock". The term has grown from there.
I got totally cockblocked at that orgy on Saturday and ended up with a dwarf exchange student.
by rockit88 April 09, 2010
An action hindering another person's progress. Commonly referenced as a sexually related progress but not exclusively related to just sexual affairs. From the European native art of cock-blocking. "Kalk-block"
My broski really cock-blocked me today by not calling me back in due time. Matt is a real cock-block, he didn't give me a phone number to a potential customer in time! Richards can be a real cock-block at times, he never includes me in his important stories! My brosef was not answering my text messages--he was acting like a real cock-blocking son of a bitch!
by Brosef Bryan March 28, 2010

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