someone who prevents someone from getting sex.
by Joey March 20, 2003
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A special door that keeps male chickens from entering a henhouse.
"Dude, that rooster is trying to get at the hens, but the cockblock is keeping him out!"
by Oleg Yavorsky March 22, 2009
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Cockblocker: 1. (noun) a female friend who accompanies another female friend to planned meetings with a male peer, to ensure that the sista does not get into trouble;
2. (Noun) a male who interferes with another male's attempt to freak the woman whom the former either wishes to protect as a friend, or is already pursuing himself;
3. (Verb) to cockblock: basically, to interfere, by way of one's mere presence, with the attempt of one person to freak another
1. Jill "Jane, I really need you to come along tonight as my cockblocker so I don't do anything I would later regret.
Jane "Sure"
2. I made my move toward that hottie Jennifer with the thought of grinding with her. That cockblocker Alex cut in and got it first.
3. Alex cockblocks all the time
by Doobie Smokes You December 2, 2004
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when you are going to hookup with some chick and then someone (her friend, cousin, whatever) comes in and sees to it that it doesnt happen
tony getting cockblocked on g5 by whatever the hell her name was.
by jim June 6, 2003
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A person who interferes with anothers chance of geting laid.
Spoon is the biggest cockblocker of them all.
by Anonymous October 5, 2003
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1. To prevent a male friend or associate from getting some action.

2. Any such attempt to prevent a male friend or associate from getting some action.
1. Damn, Johnny just totally cockblocked his roommate. Ass.

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.
by Jake April 13, 2003
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what harry potter does on the regular to ron and hermione, literally almost everyday
whooaa did you see that cockblock the other day?

yeah i can't believe harry put his arm around hermione like that, ron was totally about to make a move
by ashsal June 25, 2011
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