A cock block is when two males are moving in the same girl and the fellow with no chance prevents the second male from advancing on the girl. He cock blocked the second guy and both lose.
This scenerio involves a male "friend" of a girl who continually tries to break the friend boundry while another male moves in on the girl. When the "friend" refuses to let the new guy and the girl be alone, he is cock blocking him. In a way, he is throwing the game for both teams, since no one wins... a cock blocker!
by Penguin September 06, 2003
When your hand is down your girlfriend's panties and your mom walks in.
Got cockblocked by mom last night. Amy said she was ready to go all the way, but she went home instead and I got grounded. I might be a virgin for another week yet.
by MrKapper Is Back December 12, 2012
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, 2010
The act of a large entity using their market influence to prohibit you from gaining access to a desired market.
e.g. Why does Microsoft have to come up in my house and cock block my access to that sales channel.
by retepa April 26, 2007
The act of blocking someone else's cock, by stealing one's chances of getting LAIDDDD!
When Rachel Akiva and Bryan were all at 7-11, Bryan was hoping to get in the sack with Rachel. But evil fat Akiva cock block ed his overtures, and Bryan was left high and dry. And Rachel was not the least bit interested in Akiva's puny cock which was inversely proportional to his immensely troll-like feet.Fuck akiva fuck akiva

by Roochie February 26, 2007
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!!!!!!
by Tank AKA The other boy blue March 16, 2006
To prevent one's friend from scoring, usually by acting inappropriately in front of some sweet ass.
You're being a total Cock Block, Andy, stop doing blow on the table in front of these fine pieces of ass.
by Aneiz November 25, 2005

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