To prevent one using one's cock in the manner that one desires.
Neutering Antoine, the cute cute cat, was the ULTIMATE cock block.
by m. w. November 24, 2006

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When someone comes in between a girl and you from hooking up.
Infamous Art is still in love with a girl, so he deicided to cock block his friends from having a chance with his friend
by Killakam638 June 10, 2011

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Sometimes used by myself amongst other nerds to mean that a router or firewall is preventing a connection to a computer or server.
Friend: "Dude, I tried to log into your minecraft server but it didn't connect for some reason."

Me: "Oh, sorry my router was cock blocking you. Let me forward the right port number and try again."
by mspinkosu February 10, 2011

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when a bitch friend come in between and your lady friend when your trying to have a romantic moment
Damn man, Mehrab cockblocked me when i was trying to get my mack on with Danielle.
by lolthewhitekidfromthe818 November 05, 2010

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someone stupid and annoying who is always in the way when a guy is trying to spend 'alone' time with his girl. these are very annoying and can be often defeated by spraying water on them till they melt or kicking them hard in the genitals.
"hey did it ever go anywere with that girl your into?"
"no unfortunatly that cock blocker tommy H was around"
"dude that sucks, im soooo sorry, will you ever recover"
"no."
by funnyfunnyfunny February 23, 2010

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TOR ANDRESON aka CB- Prevents another person from scoring sexually.
dude was tryin to mack a hoe when he be jumpin in and cock blockin my game...word, not ace my friend
by ACENESS June 11, 2009

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The Urban Dictionary T-Shirt

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The Urban Dictionary T-Shirt

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Someone who will not allow to get some, whether deliberately or not.
Last night Mary was such a cock block, she was pelvic thrusting while the guy was in my room!
by git'erdone March 08, 2009

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt