When you're hanging out with a girl, and one of your friends tries their hardest to split you and the girl up as a joke. This makes your friend a cockblock.
Clayton: Hey so do you maybe wanna-
Colton: LET'S GET OUT OF HERE DUDE!
*The girl Clayton is talking to leaves.

Clayton: Thanks cockblock.
by Benqueedo Man October 21, 2016

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Some one ain't gonna get the d
Liz Hemmings is the biggest cock block known to man.
by my.michael.clifford August 28, 2014

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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

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Blocking a Male Chicken from reaching it's destination, resulting in the call "Cock Block!"
COCK BLOCK!
by rdpunk February 06, 2011

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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

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A douche bag who purposely ruins a moment.
During science my class cock blocked john and me. </3
by for Borjy. September 28, 2010

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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

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