Someone who takes or makes themselves obstacles in your way of you getting some action or a person you like or want.
Person 1: I really like Don, do you think I can get him?

Person 2: Mmm... probably but I just smashed him yesterday, sorry.

Person 1: Oh my gosh, you knew I liked him! You're such a cockblocker!!
by Corina Annetta March 15, 2011
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To fully understand the ways of a clockblock, one must set a scenario. Ok, say you've been out all night hanging with this girl, and can sense that you are mere seconds away from going upstairs too hook up with her. Here comes your good buddy cockblock. His drunk, attention-needing self jumps right into the picture and tells your woman how beautiful she is, then throws up all over her. Instead of giving you a quality BJ, she drives old Cockblock home, leaving you by your lonesome to jerk off all night.
Male: You have really pretty eyes.
Female: Do you feel like going---
Lukas: I LOVE YOU!

Male:"Damn cockblock...."
by Ruf August 27, 2005
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Anyone who prevents a male from having sexual intercourse with an another for various reasons.
He followed them home to cockblock his friend from having sex.
by B-Unit December 8, 2003
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Opposite of a Wingman. A person who deliberately gets in your way of scoring in attempt of them getting laid by the same lady you are going for. A player hater who won't let you get back on third base by blocking and gets you out of the game. somemone who has less of a chance of getting laid by the same lady and still decides to block you from getting laid as well.
In a room are two people engaging foreplay and the cockblocker walks in the room and physically gets inbetween the two partners preventing them from further foreplay/intercourse. I got cockblocked! partly due to hating on a player.
by Clinton Ziza Smith April 27, 2006
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The intentional hindrance or disruption of the act of consensual sex with malicious intent.
While I was having sex with my girlfriend, Bob cockblocked me by breaking into my room and throwing a wet paper towel at my face.
by KillaKinz March 1, 2009
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People that making getting some a lot more difficult that it should be.
Everyone I know is a cockblocker. Get a hobby that doesn't affect me, dammit.
by blank June 10, 2003
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