An actual block of wood with the words COCK BLOCK written on it. It is used when a male is talking to a female, and another male walks up with THE COCK BLOCK, sets it down in front of the male and takes over the conversation with the female.... there are several variations of the cock block... "The Pocket Cock-It" (a pocket sized cock block), "The Twat Block" (the female version of the cock block). Developed by college students in Visalia, Ca.
"Talen was talking to this chick when all of a sudden Bryant walks up with THE COCK BLOCK, and sets it down in front of him."
by Sir Pyscho Sexy May 18, 2006
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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) 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 9, 2006
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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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One who prevents another from scoring with very hot girls.
Carrie cock blocked Dave by not leaving him alone with that really hot girl.
by RJK November 9, 2005
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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 4, 2005
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To hinder, by whatever means, the chances of another male from getting a sexual encounter with a female.
Man, will you get da fuck outta here and stop cock blocking me you Ja Rule loving parasite.
by The gifted 1. June 12, 2003
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