One who, in a large group, is the black sheep. They always are trying to be cool, but just seem like a total loser and stick out. Not to be confused with some chill bro, as they are not chill, funny, or cool.
Person 1: Yo, look at that guy, he's just acting liek a total dweeb and trying to grind with everyone's girl.
Person 2: Yeah, that guy's such a shwenebag, I've seen him before
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"