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5.
(v.)The act of one attempting to prohibit another playa from gettin some neck or any other means of sexual activity
Yo son u see dis nigga tryina cock block a nigga.

ay yo u see my man over here cock blockin??
by gankzta July 11, 2003
 
1.
To hinder, by whatever means, the chances of another male from getting a sexual encounter with a female.
Man, will you get da fuck outta here and stop cock blocking me you Ja Rule loving parasite.
by The gifted 1. June 12, 2003
 
2.
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
 
3.
A dangerous impedement to getting pussy which can rear it's ugly head in many different forms and situations. To categorize a few...

1) The Third Wheel - A friend of the chick you are trying to get who doesn't want to leave her side, and will not until your target says otherwise.

2) The Lame Duck - When trying to get a slutty girl, a lame duck may be another individual who knows the sluts reputation, and is hanging around her, but is either bogged down in their efforts to spit game, or downright wasting her and your time by not getting any, but instead keeping the slut company.

3) Rich People - Sometimes at a party, those ridiculously rich white kids come down, and since most girls are attracted to money, they start hanging around them. Of course, most rich people who come down to urban parties are there for a bigger reason... to do oxycontin, cocaine, and other garbage and get our females hooked onto it. Definately one of the worst.

4) The Ex - If your potential mate has an Ex-Boyfriend somewhere in the premises, things can get ugly if he's the hothead type. Thankfully, I'm a Marine and could careless about a civilian, but for other people who aren't deadly weapons by law, just keep your eyes out, these morons can not only cock block your entire operation but can get the jump off blown up too.

5) Accidents - Sometimes even your closest buddy might let something stupid slip, like that time you had that threesome with your potential mate's sister. Or it might be a cock blocker letting it slip intentionally. Me and my clique follow a strong code of silence on matters like this, but when it comes to getting the finest bitches, trust can fall like a house of cards in a hurricane.

There are many more you might have the misfortunate of encountering. Just keep smooth casanova and you can sometimes blitz right past them and go straight for it. After that, all you need to worry about is not getting burned.
1) I wanted to talk to that girl alone, but her bitch friend kept hanging around us being a third wheel cock block.

2) That dude keeps trying to holler at that slut but isn't getting any, and I'm the one who called her to come here and give me brains in the first place.

3) I was hollering at this chick when these random white dudes from the sticks came. Next thing I knew, the chick was strung out on coke.

4) I was fingering this chick in the back, when her ex comes in and starts wiling out.

5) I was spitting mad game at this chick, when my drunk ass friend comes over and says "Isn't her sister the girl we gave the goggles too that night?"
by The Sub January 09, 2005
 
4.
When a guy or a friend tries to get with a girl your talking to, hence, "Cock-blocking". Keeping you from getting a piece of ass.
"Dont be cock-blocking me from my girl you fag!"
by Johnny B September 03, 2003
 
6.
Something that should be a illegal.
An act of stopping someone from getting laid.
You're like a giant... cock blocking robot, like developed in a secret fucking government lab.
by FUCKWE'REALLDEAD September 10, 2010
 
7.
to be unaware of the fact that your the third wheel, or to constatly be keeping a couple from going into "cake mode"
to purposally keep a couple from caking or two people from flirting
girl 1: hey, look at dave & kirston..
girl 2: haha, their tryig to be alone!
girl 1: too bad tyler isn't letting that happen, he's cock blocking!!
girl 2: yeah! i mean, obviously they came here to cake, not so they could listen to tyler talk about his "issues" ?! haha
by &roni;hollaaa April 30, 2009