When someone or something gets in the way of or messes up intentions of performing sexual acts involving your cock.

(From Super Bad)
Me: I was so close, but he totally just cock blocked me.
by tcady123 August 12, 2008
when you are gonna get some, but then something stops you..
getting cock-blocked is when your cock gets blocked from getting any.. ex. my mom walked in on me and stopped me from tappin that
by Alec Mudd July 17, 2008
When a someone you know prevents you from looking good in front of the ladies
Jon Dejesues
aka animegamer
by miguel June 06, 2004
The fastest way to end a friendship.
Nick: Dude, John totally cock blocked me last night. I was trying to get some action but he wouldn't leave the fucking room.
George: Fuck John.
by Juared September 02, 2012
The ex that hangs around so your not likely to get any.
John just kept on hanging around, killing any chance of getting laid by Peter...John was such a cockblock!
by Jewels49 February 04, 2010
A buddy that is pure repulsive to the ladies to the extent that his presence prevents you from getting any action.
"I hate going out with George, he is such a CockBlock!"

"I was just talking to a gang of hotties who were gagging for my cock and then George came over and and they all said they had to catch a taxi. I was practically guaranteed some tang, George is such a CockBlock man!"
by Hentsep Renge March 03, 2009
A person who blocks the 'cock' from reaching its intended destination.

Stop being such a cockblock, he's trying to 'bag' her.
by apparentlymyname isbeingusedby January 24, 2009

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