A cock Blocker is a person close to you or of just general aquaintence who prides him or herself in screwing up your chances of getting a sexy time with a girl you're trying to get with. He or she does this by saying wildly innappropriate things about you or your potential sex partener. Or by just making the situation awkward by doing something stupid to either or both people. This block's the boy's cock from getting in a girls's smock.
1."dude, did your friend just slap my ass?"

"he's not my friend anymore (goddamn cock blocker!)"

2. jack is cuddling with jill and jimmy comes around the corner. jimmy says as he passes by: "hey jack, how's your aids?" jill says: "you have aids? maybe we shouldn't do this" jack says "ima kill that sonofabitch"
od uživatele Your MOMMA said im hot 08. Září 2010
A male not allowing another male get some...( hitting a home run)
Ex:

Lana: hey Clark, wanna come over my house today?

Clark: sure

Lex: dude,you can't go. We have B-ball practice today.

Clark: oh yeah that's right.

*moments later after Lana leaves*

Clark: Lex what's your problem?....you're such a COCK BLOCKER!
od uživatele D.L.R. 91 01. Březen 2008
A Guy/Girl Who Always Annoy's You While In The Process Of gettin With A Chick Or Gettin Her #
Dav Cock Blocks to much
od uživatele Anonymous 05. Duben 2003
A guy who tries to steal another guys girlfriend/date etc.
od uživatele Anonymous 20. Březen 2003
to try to stop one from getting booty
stop cockblokin nigga
od uživatele bernard 03. Prosinec 2003
A woman/girl (usually ugly) who is jealous of the fact that her friend gets dick, whilst she doesnt. thus she tries to block all cock directed at friend. the ugly bitch.
Susan stopped me from fucking helen because she was 'too close'
od uživatele p 30. Březen 2003
someone who literally blocks a cock.
some guy rips off his own cock and then tries to shoot it in the basket. His friend then blocks it from going in.

"ahh dude I almost got it in the basket for a score! You're such a cock blocker!"
od uživatele waterboy141 04. Září 2009

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