to prevent a friend from hooking up with someone, maybe because she's too drunk or perhaps because he is supa busted. it could be the other way around too.
"Sweetie, I'm going to have to cock block here. Homie looks mad busted and I know you don't want to wake up in the morning thinking 'What The Fuck'."
by dopeLabber November 28, 2001
when a man is attracted to a women then another man comes and steals the women from the other man
Randy is such a cockblock.
by Ijihg April 22, 2010
when a member of the same or opposite sex impedes the attempts of a male to "Get Some Pussy" or "Get Some butt hole". cock blocking can also be considered when one man goes to cock slap a chick and another guy hits the cock down with his hand, hence that guy is gay. ie. the exact opposite of a straight man/cock guider.
"Goddamn it i am soo sick and tired of Bennett cock blocking i totally would have gotten some pussy all up on my dick if he wasn't cock blocking me soo much!"
by Scotty and Nick December 07, 2007
when someone prevents you from tappin' dat ass.
damn... that muthaf**ker tried to cock block my ass.
by adrian November 27, 2003
when a guy sees a girl and starts to pop a boner by he can't because he's either in a public place or around people.
Steven: "oh man see that chick?!"
Pete: "yea dude she's a hottie"
Steven: "dude I'm getting hard just lookin at her..."
Pete: "here comes the boss!!"
Stevn: "oh man that's a cock blocker."
by Hotpinkluvr May 13, 2009
when some interferes with the desires of a cock
i was talking to this girl and kenneth just walks up to me and tries to start small talk... fuckin cockblock
by the man who fucked your wife August 03, 2009
when a gay guy ruins the chance for another gay guy to get laid by crash their conversation
I was this close to taking this hottie home with me, but then an ugly bitch came out of nowhere and cock blocked me
by TLV Biatch March 26, 2009

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