An act of obstructing one person's advances towards another or preventing a person from action, especially sex.
BABY MAMA: I'm talking to this guy now name Terrence. He's a nice and comical guy.

BABY DADDY: You gonna have to cut that man off, I don't care if he's nice or not, he better not be in the picture.

BABY MAMA: Oh, now you wanna cockblock for the simple fact that I moved on without your sorry ass.
by Mr. Terrence L. Trezvant December 02, 2004
When you are denied or blocked from sexual activity or arousal
Bertha's brother came home early, what a cock block.

Rita's Dad stayed in the same room watching TV with us, he is such a cock blocker.

The girl next door closed her blinds before she start to change, what a cock block.
by RuneX December 02, 2003
When your hand is down your girlfriend's panties and your mom walks in.
Got cockblocked by mom last night. Amy said she was ready to go all the way, but she went home instead and I got grounded. I might be a virgin for another week yet.
by MrKapper Is Back December 12, 2012
The act of a large entity using their market influence to prohibit you from gaining access to a desired market.
e.g. Why does Microsoft have to come up in my house and cock block my access to that sales channel.
by retepa April 26, 2007
The act of blocking someone else's cock, by stealing one's chances of getting LAIDDDD!
When Rachel Akiva and Bryan were all at 7-11, Bryan was hoping to get in the sack with Rachel. But evil fat Akiva cock block ed his overtures, and Bryan was left high and dry. And Rachel was not the least bit interested in Akiva's puny cock which was inversely proportional to his immensely troll-like feet.Fuck akiva fuck akiva

by Roochie February 26, 2007
To prevent one's friend from scoring, usually by acting inappropriately in front of some sweet ass.
You're being a total Cock Block, Andy, stop doing blow on the table in front of these fine pieces of ass.
by Aneiz November 25, 2005
a friend (usually male) that will not allow one, to sex up someone else (usually female)
Man, why did that asshole cock block me last night, she was so drunk I was gonna get some.
by angle November 30, 2004
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