1) The prevention of a potential hook-up. Either done by a jealous friend/douschebag, or by an overprotective friend (Mother Hen) of the girl involved in potential hook up. (see game killer.

2) The act of "cutting" at a 4-way stop sign and "cock-blocking" someone who has waited thier turn at a stop sign.
1) Guy 1: I'd really like to see you again.
Girl 1: I don't have to go home tonight.
Guy 2: Hey Carl, remember that time you shit yourself?
Girl 1: Ummm... I have somewhere to be...

2) This dumbass in a drivers ed car just cock blocked me at the stop sign. So I tailgated the fucker till he ran of the road, it was my turn at the stop sign, he needs to learn his place.
by Keifer Jennings November 8, 2006
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Preventing a fellow male from tapping ass when hes going down the stretch. A man can cock block inadvertently but it is often done out of jealousy or asshole-ism.
"That loser couldn't get a chick for himself so he decided to hang around like a third wheel and cock blocked me instead."
by rick_james_bitch September 21, 2005
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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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when you're talking up a bitch and a male friend of hers or yours comes into the conversation.
I was just about to close the deal with her and some Dick comes over and cock blocked me.
by Joe Bru October 18, 2006
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Preventing some unsuspecting moron from getting laid one night, or possible ever.
A kid walking with some chick in a parking lot gets soda thrown all over him by people driving by in a car. Therefore, he isn't getting any of that pussy that night. Or ever.
by Big Boss March 19, 2005
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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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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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