1. when a guy who is interacting with a cute girl hoping to get ahead sexually is blocked from taking it farther by someone or something

2. either devine intervention, karma or poor luck preventing a guy from getting laid or succeeding sexual with a girl.

3. when a friend of either the guy or girl prevents the two from hooking up
I can't believe you just fucking cock-blocked me you prick, your like a cock-blocking dog that just pops up a the worst moment to fucking kill someones chance's of fucking scoring!
by calaco May 29, 2011
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In the last 20 seconds of the Sherlock BBC episode, "The Great Game", Moriarty decides to be a total Cock Block.

Sherlock: "What you offered to do back there it was...uh....good..." *blush*
John: *epic smile*

Audience: MAKE OUT!!
*Sniper riffles shown from above*
Moriarty: SORRY BOYS I JUST COULDN'T STOP HERE!!!!!

Audience: ........Fucking Moriarty.......
by WatsonFan January 25, 2011
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A douche bag who purposely ruins a moment.
During science my class cock blocked john and me. </3
by for Borjy. September 28, 2010
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To get cock blocked by another man. An act of desperation made by a loner who will look at no means in order to step up from being a third wheeler in order to prevent you from reaching endless orgasms, so he can then make his move. Also known as pulling a Trivs.
Ferdinand wanted to have a go at blondie but he was cock blocked by Jerome all night. Jerome pulled a trivs on Ferdiand.
by Americanplayboy69 April 6, 2015
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1)When a girl's friend gets in the way of you making move on a said girl
2)When a jealous ex gets in the way of you hooking up with thier ex-girlfriend.
3)When some one accidentally gets in the way of you and a hot chick.
4)When a family member gets in the way of you and a hot woman.
5) Something complete asses do because they are jealous or just hate you.
1) man#1.Dude so we where hanging out and stuff and her friend Taylor came up and talked to her the whole time it was a huge cock block.
man#2.Ouch man that sucks.
2)man#1.So we were talking at the party and out of now where Kevin her ex boyfriend from a month ago cock blocked me.
man#2. Ouch man that sucks.
3)man#1. Dude last night i was talking to this hottie and my homie walked up and started talking to me, and i couldn't do anything cause he is my dog and he didn't mean to cock block me.
man#2.Ouch man that sucks.
4)man#1. Dude last night I got cock blocked by my grandmother!
man#2. HAHAHAHAHAHA thats hilarious, your grand mother? hahaha ouch man that, thats hillarious!
5)man#1. Dude last night I was going to get laid and some complete ass walked up and cocked blocked me, If I ever see that ass hole again I'm going to kick his ass.
man#2 Ouch man that sucks.
by It's spelled with two T's! November 2, 2008
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An ancient Chinese kung fu move which involves a male or a female (hopefully not) whipping out their dick and using it to block a karate chop, hence the name Cock Block. It has the potential to hurt the owner of the dick, but usually ends the fight with the owner of the cock being victorious. This is due to the fact that the other fighter is afraid (usually) of touching the dick, because they don't want to become gay by doing so. If you're fighting a girl.... um i guess you're screwed
Dude 1: Dude I pulled a cock block last night in a fight!

Dude 2: Dude, that's gay.
by Big Chee October 10, 2008
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n. A person who cannot stand the site of a friend getting laid and therefore has to prevent any possiblity of this happenning.
My friend Crookshanks is such a cock block, he should wear shoulder pads when he goes out to the bar.
by Don't you want to know May 29, 2005
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