one guy ruining another guy's chance to score some booty
That fucking punk-bitch took my seat at the bar and eventually took home the girl i was talking to. He was totally cockblocking me.
by WillyStyle October 24, 2007
Get a cockblocking mug for your mate James.
Adding a retarded programme on a friend's computer so he sees flying dicks on his screen and his computer is fucking blocked. yeah.. really.
Yuks is a cockblocking legend.
by The Flying Dick November 03, 2009
Get a cockblocking mug for your brother Manley.
adj. n. A person, ussually a female that her freind brings along on a first date in order to prevent you from having intercourse with her.
If that her FREIND wasnt such a cockblock i would have banged that girl!

I hate that girl's bestfreind, she's such a cockblocker.
by chris September 04, 2003
Get a cockblocker/cockblock mug for your coworker Trump.
A male who unwittingly(out of ignorance) or purposefully(out of jealousy) prevents another male from engaging in debauchery with members of the female sex. Females can also cockblock, but the true essence of the word lies in the metaphor of the penis used figuratively as an impediment which thwarts any possible chances of scoring with members of the opposite sex.
friend # 1 interrupting friend # 2, who is conversing with a female at a local bar.

"Hey i don't mean to interrupt, but did you ever get the results of those STD tests that you took?

"Hey, does your Wife know where you are tonight?"

" Does your probation officer know you are here tonight?"

'What we talked about before, your experiences with Thai She Males... it's totally between us. carry on!"

"Friend # 2-- Boy, you really are a cockblocker, aren't you?
by Lex Taliones January 17, 2010
Get a cockblocker mug for your coworker Manley.
A special door that keeps male chickens from entering a henhouse.
"Dude, that rooster is trying to get at the hens, but the cockblock is keeping him out!"
by Oleg Yavorsky March 22, 2009
Get a cockblock mug for your mom Beatrix.
Cockblocker: 1. (noun) a female friend who accompanies another female friend to planned meetings with a male peer, to ensure that the sista does not get into trouble;
2. (Noun) a male who interferes with another male's attempt to freak the woman whom the former either wishes to protect as a friend, or is already pursuing himself;
3. (Verb) to cockblock: basically, to interfere, by way of one's mere presence, with the attempt of one person to freak another
1. Jill "Jane, I really need you to come along tonight as my cockblocker so I don't do anything I would later regret.
Jane "Sure"
2. I made my move toward that hottie Jennifer with the thought of grinding with her. That cockblocker Alex cut in and got it first.
3. Alex cockblocks all the time
by Doobie Smokes You December 02, 2004
Get a cockblocker mug for your friend Nathalie.