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!
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.
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.
Stereotypical middle-aged, balding, hawaiian-shirt wearing, IROC Camaro driving man with a beer gut, rose gradient sunglasses, and a trophy wife to whom he is 20 years her senior.
I hope I never end up like -that- guy.
some guy who's just like the guys over there. end of story.
That guy : " hey watzup... gee wiz I'm just like the guys over there."
END OF STORY
The one person who, with a broken-up couple in a crowded room, says something loudly that would imply that the couple is dating.
This inevitably happens for each badly ended relationship once word spreads to everyone except "that guy" that they are through.
"Hah, hey you two, when's the wedding?" -that guy.
One who does something stupid, annoying, or pointless.
One who asks questions they know the answer to simply to try and feel less stupid.
Anyone who fucks up.
*proffessor writes 5+5=10*
Prof: See, the result is 5.
That Guy: duh.. don't you mean the result is 10??
Everyone Else: Shut the fuck up dumbass, stop being that guy.