A buddy that is pure repulsive to the ladies to the extent that his presence prevents you from getting any action.
"I hate going out with George, he is such a CockBlock!"

"I was just talking to a gang of hotties who were gagging for my cock and then George came over and and they all said they had to catch a taxi. I was practically guaranteed some tang, George is such a CockBlock man!"
by Hentsep Renge March 3, 2009
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An ugly and/or fat girl or gameless dude who, out of lonliness or possibly sheer contempt keep others from achieving sexual satisfaction with a chosen partner.
That motherfucker Jrge is a cockblocking motherfucker
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The ex that hangs around so your not likely to get any.
John just kept on hanging around, killing any chance of getting laid by Peter...John was such a cockblock!
by Jewels49 February 4, 2010
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a fat ugly man who tries to get in the middle of all your relationships.

You do not want this fat ugly man yet he tries to raise hell between you and your boyfriends or guys you talk to.

He's the ultimate cockblocking hater who's mad he couldnt get laid if his life depended on it and needs to go the hell away.
Vitale is a big fat hairy italian cockblocker who needs to go croak.
by not your girlfriend January 28, 2009
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when you are excited about getting a girl who you really like and a stupid dumbfuck fucks it up for you!
otis scrivner cockblocked me last night, so now i'm going to jack off on his face!
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This is the act of a good male friend (or sometimes a boyfriend) moving closer to a female friend of his or even dancing with her so that a sketchy, unknown man does not start to get too close. This act is often performed in crowds (ie. clubs).

Often times, if there are more than a 1:1 ratio of guys to girls, a single guy may have to cockblock for many of his female friends/companions.

This is usually appreciated by the female, who generally thanks the male in the cab ride back.
That sketchy guy was hitting on my friend so I had to act like her boyfriend, thus cockblocking that sketchy guy from grindin on my friend!
by Amaan July 26, 2005
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The less attractive of the two. She'll ruin your approach, flow, and groove. She will stand in the way of you making your move. Insert your best friend to run interference for a couple of plays. Get some and then break up with the girl saying that you don't want to see her anymore because of her annoying friend. Problem becomes solution.
John blocked the cockblocker so I could knock it with Cheryl. John ditched the cockblocked after eating all the candy bars that she had in her purse. I got laid and then broke up their friendship (for her own good) and now it's Saturday.
by Christopher Handsome March 28, 2003
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