1. A female who accompanies her male friend(s) out and then prevents them from getting any attention from other females by her mere presence. Other females will think she is his girlfriend. So then if he tries to run his game, he looks like the asshole who is hitting on other girls right in front of his "girlfriend."

2. An ugly girl who comes out with her cute girlfriend(s) and prevents the cute girls from getting any game.

3. "Girls' night out." This is a cockblocker by virtue of its name and implications. There will inevitably be a girl or two in this group who are man-haters. They will brainwash their cute girlfriends into thinking men are bad, players, jerks. They will convince their cute girlfriends that girls need to stick together, no men tonight.

1. Joe: Does Judy really need to tag along with us tonight? She's such a cockblocker, everyone thinks she's my girlfriend!

2. Cody: Hey Trevor, that girl is cute. Will you be my wingman and distract her ugly friend while I go talk to her? Trevor: No way dude, her friend is hideous!

In this situation, the ugly girlfriend is cockblocking her cute girlfriend.

3. Jessica: It's girl's night out! Yayyy no guys tonight! Ok girls, remember, we gotta stick together. Don't get sucked into any man-traps!
by TNTgirll September 15, 2007
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someone who prevents a guy from using his dick to satisfy a woman
That fuckin cockblocker wouldn't leave Tom's house last night when he was anxiously awaiting to fuck Sarah.
by Katie S. March 21, 2006
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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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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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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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one who prevents one from engaging in pleasurable experiences with another person.
this scenario generally happens when the "cockblocker" is jealous because THEY aren't getting and if they can't have any then neither can you.

cockblockers come in many different forms. Such as the one upper, the show off, the moneybags, the never ending bullshitter and the man with the stuff.

ex "dude! why you gotta bring up old shit. i was totally about to hit that. you're such a cockblocker"

ex "i was totally about to bone my girlfriend, and then Nathan showed up and she said there was no way"
by the DanL March 17, 2010
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