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That Guy is usually a bad thing could be a positive depending on context. A person will usually say that guy because he lacks social classification and is usually out of the loop hence the person's name is unknown or intentionally ignored. That guy may have the charisma of an ignoranus and may often be referred too or beckgoned with references like douche or douchebag and ass. That guy also can be a piece of shit that you want gone but he hangs around like a dingleberry.
To sum it up you don't want to be that guy.
Glad I'm not that guy! That guy is a dumbass! Who is that guy!?
The guy who comes on to an urban dictionary and writes definitions about people's names in a fit of rage. They usually don't realize the effect that this might have on that person. These guys are the fucking worst, often seen getting mad at the smallest things imaginable. They are dicks and get mad if someone tells them their a dick. They refuse to admit they're wrong unless there's a large group of people going against him. They are the guy that everyone hates and takes advantage of people.
If your That guy go fuck yourself
An excellent YouTuber, some may call him the father of YouTube or the king of YouTube. He’s the most good looking person around and is all around awesome.
Guy 1:who’s That Guy
Guy 2:Don’t you mean who’s Pewdiepie
Some know him as the father of YouTube or even the king of YouTube.His videos have no flaw neither does his face. He’s been know to get billions of views on multiple occasions
Guy 1:who’s that guy
Guy 2:more like who’s Pewdiepie