one who prevents the cock from being unleashed upon a woman.
I had a hot girl in the room, but Alex would not quit playing WoW and subsequently became a cock block.

Me: "Alex...girl...in...room.."
Alex: "no, one more raid, there's a hot sorceress in here, i think she wants to get into my pixel pants."
by DeerPark1515 December 1, 2006
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Something that keeps you from getting action.
That bitch scares all the other chicks away! She's a total cock block.
by Batman November 10, 2001
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1. Someone who stops someone from having any type of relationship with someone else due to reasons of jealousy or anger.

2. Someone or something who stops sex from occuring with thier presence, accident or not.
1a. A girl who is ugly and/or fat who has a pretty friend. She stops guys from dating this pretty girl because she thinks 'if I can't, than niether can you'. What a bitch.

1b. A girl who is ugly and fat who got rejected by a man. She then spreads rumours and lies to anyone the man has his eye on trying to get them to reject him. WHAT A BITCH

2. A kid wants to score but his parents are always around, never leaving an opportunity. They are cock blocking.
by Cybernetico January 2, 2005
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An ancient Chinese kung fu move which involves a male or a female (hopefully not) whipping out their dick and using it to block a karate chop, hence the name Cock Block. It has the potential to hurt the owner of the dick, but usually ends the fight with the owner of the cock being victorious. This is due to the fact that the other fighter is afraid (usually) of touching the dick, because they don't want to become gay by doing so. If you're fighting a girl.... um i guess you're screwed
Dude 1: Dude I pulled a cock block last night in a fight!

Dude 2: Dude, that's gay.
by Big Chee October 10, 2008
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Any object, person, or idea that has the acute ability to discourage sex.
I was SO for it, but she said she was saving herself for Jesus. Shit, religion can be a cock block.
by King Oyster Smash December 31, 2011
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An application that chat roulette needs to add that literally blocks cocks from the screen. This would entail a cock-identifying application that would need to work better than facebook's face recognition feature. It would also cut down on 90% of chat roulette users.
He was going to flash people on chat roulette, but the new application cock blocked him. He's gone back to flashing girls at parties.
by Architect of Destruction November 23, 2010
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An all male dorimtory hall in college
by Anonymous November 5, 2003
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