Top definition
One who prevents another from scoring sexually.
Trudy and Dan frequently had time alone but her cockblocking roommate ruined any chances they had to have sex.
by Miss Priss April 13, 2003
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May 8 Word of the Day
1. Slight sins or offenses
2. Petty crimes or small infractions
3. Las Vegas Punk Rock!
Peccadilloes shows rule.
by James Messina August 11, 2006
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2
1. (n.) A result of a friend, stranger, or acquaintance making sexual relations or intercouse impossible (by accident or purposely) with a member of the same or opposite sex.
2. (v.) To make the act of having sexual relations with a member of the same or opposite sex impossible (by accident or on purpose.)
1. "Last night I was chillin' wit Shorty at a party, when some dude walked into the wrong room and she didn't feel like doin' it no more...I was an unfortunate victim of cock-block.

2. "Last night I saw James tryin' to hook up wit Jenny and he knows I like her! So, before she left wit him to the other room, I told her that he has Herpes. Next time I talk to him I'm sure he gonna wanna kick my ass for cock-blocking him."
by Jessica January 17, 2005
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3
A special door that keeps male chickens from entering a henhouse.
"Dude, that rooster is trying to get at the hens, but the cockblock is keeping him out!"
by Oleg Yavorsky March 22, 2009
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4
interupting on a buddy or someone while he is trying to get with a girl
Wow, that guy is being a real cock-block.
by Fava October 03, 2005
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5
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
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6
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.
by Jake April 12, 2003
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