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.
door Jake 12 april 2003
1)Any person or group of persons interfering with an attempt someone is making to have sex with someone else.
2)The City of Pittsburgh.
3)That twitchy guy who just ruined the mood.
Joe, John, and Harold tried to cock block Steve, but it didn't work.
door Hung Lo 1 mei 2003
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?
door hahhahh hallie. 6 april 2009
- third party that keeps you from engaging in sexual activities with that special someone in a given amt. of time.
I can't believe her. She could obviously tell we wanted to do stuff. She's such a cock block.
door Poseur 3 december 2005
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.
door King Oyster Smash 31 december 2010
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.
door Architect of Destruction 22 november 2010
someone who prevents others from pulling
(doing a mark)
Guy - Hey, do you want a drink?
Girl - Yeah, sure
COCK BLOCK MARK - YEEAAAH, THREE POINT ONNEEE
Girl - *Leaves*
door Anonymouswindsor3.1 27 oktober 2010
Someone who has, will, or wants to prevent a friend/random person from getting laid by a member of the opposite gender. Also, when a person knows he's not getting a piece of tail will do absolutely anything, best friend or not, to make sure nobody gets a pice of tail by the end of the night. Someone who will convince a member of the opposite sex to go home, instead of going to a party they were really excited about, by telling lies to prevent any others from having a chance of getting lucky.
When Kyle, John, and Boy Blue were chilling at a karaoke night, John invited a girl to com to the after party. On the way to pick up boy blues truck , Kyle was guranteed a piece of tail, for she was licking his ear. After Boy Blue had gotten his truck, Jenn decided to go with him. He then convinced her to go home, by telling her that Kyle and John were bad people. Steve IS A COCK BLOCK!!!!!!
door Tank AKA The other boy blue 16 maart 2006
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