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
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
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
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
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
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
An attempt to block another's sexual intentions by an object, friend (or foe), family member, pets (kittens), or extraterrestrials (the womens friends).
When trying to seek action from your female counterpart, you are interrupted by the "cute" kittens (cock blocks) who were sent from Hell to ruin your intentions.

You have been planning on watching a movie with your female counterpart, with hopes on "gettin" in there. You recently found out that a chick flick was rented, and all the extraterrestrials are going to raid the bedroom, ruining any chance of stimulation.

When a friend or foe approaches you and the smokin' female your mackin' in a bar, and asks if your herpes have flared up recently.

by Mist_SiR February 13, 2008

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