A man than manages to block his own cock from getting action as a result of being repulsive and/or having no game.
Guy 1: You get it in last night?

Guy 2:Nah, bro. I had a Self Block Cock Block(SBCB) night.
by CSB Fern February 21, 2012
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When someone prevents, accidentally or intentionally, two people from having a conversation or intercourse. Blocking the cock can be done by jumping into an existing conversation, positioning oneself between two other people, or drawing attention to oneself.
Girl A: Nick and I were talking when Sophia comes over and starts asking me about homework!

Girl B: I know, she's always blocking the cock
by blocking the cock June 15, 2011
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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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