What's on your mug?

To provide a metaphorical, but quite effective, block of your friends cock with a woman's vag!

"Yo Bob, that fuckstain kid Doyle, just cockblocked me from getting another piece of ass!" "What a cockblock!"

By Omanz

When a guy gets in the way of you trying to get with a girl.

You are about to take a girl to your apartment so you will be alone and your friend comes tag along and messes up you chance of getting laid.

By Chad Hayward http://www.chadhayward.net

The 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.

By Mr. Terrence L. Trezvant

One of those things they put in between each urinal in a lot of gents public toilets so there is no peeking.

Thank God there's a cockblock there, Steely was trying to look at my package.

By Martin

Someone who games on the women you're lookin' at, even though they know you're goin' after them. See Walking Cockblock and SlickD

SlickD is the biggest cockblock. He's always hittin' on my women.

By Gaetani