"That guy" refers to the narcissist inside each and every man. "He" is "That guy" when he gives into the urges (usually pertaining to sexual gratification) to the detriment of those around him. Nobody wants to be "That guy".
Bob: "Dude... don't freak... I got a blowjob from your sister last night ... but I don't want to be 'That guy'".

Another Bob: "Look at 'That guy' next to 'prince cassius' in the fashion section of the evening standard".
by jeffreythefarmer2 August 17, 2010
The guy everyone talks about.

The guy everyone would want to be friends with.
The guy everyone wants to hate on.
The guy everyone wants to be.
All of the above.
Man, who's that guy? I hate how he thinks he's the shit... lets be his friend!
by yoshi123456789 August 17, 2010
The awkward guy nobody knows who inexplicably makes weird faces in the background of every picture.
Girl: Look how cute our prom pictures are!
Boyfriend: Yeah, except for That Guy.
by skittlesbunnyx3 July 10, 2008
An actor whose face you recognize from other movies but whose name you don't know. Once That Guy's anme becomes known, he ceases to be That Guy. That Guy alums include Joe Pantaliano, Steve Buscemi, CLint howard, etc.
"Hey! That Guy!" (said while watching Out For Justice and the Mexican goon with the tattoo on his neck walks onscreen)
by Marcel Leroux August 17, 2004
a term given to a person who is in fact there, yet not there in person. the kind of person who when you see you're all like: Wow, he's in this class? and when they leave, you don't notice their absence.
person 1:WHO THE F*** IS BOB?
person 2:He's that guy in our geo class dude...
person 1:OH!!! that guy!
by JeremyD December 07, 2006
At any social gathering, someone who can not handle thier booze, needs to be escorted out of the situation, possibly by force
Mike: did you see that guys get pepper sprayed, tased and ruffed up
Jimmy: Yeah that guy was loaded.
by MikeGol August 22, 2008
That guy, is the person who enters an online video game just to mess with people. The "That Guy" is in every game room. He/She can range from someone who just messes around killing his teammates or someone with just a high pitch voice.
That Guy: Oops I killed my whole team again.
You: Oh great its That Guy.

Kid with high pitch voice: Hey guys are you ready for fun?!
You: We have officially found That Guy.
by Todd Feipel May 14, 2008

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