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...
ay yo u see my man over here cock blockin??
An act of stopping someone from getting laid.
to purposally keep a couple from caking or two people from flirting
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