A burn, or sting, breaking another person's argument. This is mostly used in Brussels, Belgium.
Dude 1: People can be soooo stupid.. blablabla.
Dude 2: Well, if you ever went outside you might notice that there's a lot of people that are relatively interesting, but you prefer to sit in your house and play WoW all day.
Random bystander: NNNOOOOOOOOOOHHHH SCHMET