Make it your own! He is different for everyone.
DOOD! That guy did not have good banana Etiquette!
Someone who defines themselves as "That guy" ; signifying that they think that they are the dominant one or above others in a certain thing or activity.
"Trust me pal, I'm that guy."
"You're not that guy, bro. You're not that guy."
that guy who is really nice. Often the nicest person you will ever meet. However
this comes with a price. Let him get to comfortable or else he will begin
ditching you, often to make love to his cousins involving but not limited to
anal, vaginal, oral, ear, and belly button. Oh yeah and cock slit. Oh yeah don't
let him around girls cause he will brag but really he will stub his toe fall
then go lay in the corner and mope. Mope like the biggest bitch. He also has a
really small penis. He also may be caught up in the act of making secret pornos
with his sister,cousins, and last but not the least his stuffed bear.
Girl" who was that"
Other girl" ugh that guy, why did I let him get so fucking
comfortable around me."
Girl"having sex with his cousins."
Other girl"YEP!!!!"
Girl" wow this summer chris is cool"
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