an asshole dude that fucks up your chances of fuckin some bitch
by OnE LoVe August 10, 2003
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Originally meaning when a person is about to engage in sexual activity and a person (family member, friend, child etc.) stops any chance of doing so. This can also be applied to any day to day non-sexual activity. Such as going out with friends, smoking bud, etc.
"Dude, I was guna get some ass, but then her best friend, who I think is a dyke and totally has a crush on her, cockblocked me."

"Fuck man, we were going to the movies, but then my mom cockblocked me."
by pistolpetee January 5, 2010
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A guy/girl, especialy friend or family who intentionately or not stops you from getting laid...it can be done by phone, visiting, etc.
I was about to lose my virginity, when a Maniac friend of mine called to ask if i was watching T.V. Because of that cockblocker I missed my chance...
by I-Maniac February 8, 2007
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COCKBLOCKERS ARE BOYS WHO STOP THEIR FELLOW BROTERS FROM GETTING SOME PUSSY
I WAS ABOUT TO BANG THE HELL OUT OF MY FAT SISTERS HOT ASS FRIEND , WHEN THE COCKBLOCKER,MY BROTHER CAME INTO THE ROOM , AND TURNED US BOTH OFF.

NEXT TIME HE DOES THAT I WILL DUCK TAPE HIM UP AND THROW HIM IN THE SHED OUTSIDE IN AN OLD BOX. =
by NIKKI JOSEPH LAROUSSE June 10, 2009
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A device used by fat girls to prevent their hot friends from going home with you.
John was about to go home with some hot blonde until her fat friend cockblocked him and went home with her instead to eat candy bars and watch the Tyra Banks show
by TheFrost February 24, 2007
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A person who has unnatural tendencies to stop sexual encounters before they begin.
Terrible. Some chick cockblocker screwed me big time
by Meandmybaby June 28, 2011
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