The male definition of cockblocker is to sabatoge another guys chance of scoring with a chick. This concept was foreign to me until going out on occasion with my college roommates friends.

While one guy was is the bathroom, another guy would tell whatever girl was there things like... its a shame he has been unemployed for 3 years..... rough deal with that restraining order.... he doesn't pay his child support for his 4 kids........he is changing his colostomy bag...it wasn't his fault he caught herpes..... Stuff to that effect.. The girls wouldn't say anything when the guy comes out of the bathroom, the guy of course doesn't score.. then they never even tell the guy that was in the bathroom what they said to the girls.....

Shit is reprehensible..
Steve was a cockblocker when he told the bartender Paul was out on parole when he was in the shitter
by teabag September 12, 2007
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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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