Taint

I think everyone's known someone who's nickname should be Taint.

Y'know, someone who always has a thin layer of stinky drunk sweat on him who just looks dewey in a dirty way all the time. And when everyone's sitting around talking at a party, and the conversation gets into those things that everyone thinks but never says out loud because it's just not really done, Taint will just come out with the most disgusting socially taboo comment and then say "what?" when the group falls silent and move their body parts away from the body parts of others.

Think Kevin Federline.