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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A person who gets in the way of a couple getting their freak on.
A prison worker who tries to keep a couple from havin congigal trailer visits so they can get their freak ON is a def cockblocker.

They don't do their job, delay the paperwork and even lie instead of simply finishin stuff up.

by Sexy Sadie69 December 16, 2007
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A person who blocks the action of a guy trying to make a move on a girl.
**sitting on the couch**

Dave: Hey hallie, your very pretty.
Hallie: why thank you.
*dave leans in to kiss her*
*sarah walks in & sits in the middle of them*
Sarah: hey guys! nice night? yes?
Hallie: WHY ARE YOU COCKBLOCKING?
by hahhahh hallie. April 6, 2009
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