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.
door JC McFly 13 september 2007
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.
door BigK1D 28 april 2004
A person who is not important enough for anyone to remember their name. That guy is most likely a loner or socially awkward.
Who the hell is that guy and why should I even care?
door The Kazman 3 maart 2010
The guy driving down the road with his arm out of the window, holding a mattress to the top of his car.
"You don't wanna be that guy."
door jahburbie 8 december 2005
1. a male who commits and act of stupidity in a public place.

2. the scapegoat for any act of stupidity you personally committed.
1. Dude! Look at that guy getting head from a fat chick!

2. Dude! It wasnt ME it was That guy!
door CAck Master 25 juni 2003
"THAT GUY" is the guy everyone wants to be but cant...
Girl 1: hey sara whos that guy.

Girl 2: idk but i wanna meet him.

example 2

Guy 1: yo dude whos that guy flirting with my girlfriend.

Guy 2: idk but dont mess with him cuz hes "THAT GUY".
door "THAT GUY" 13 augustus 2006
go to www.dontbetheguy.com . That will provide all the definition you need
Don't be the guy who leaves the seat up.
door Jamie 3 mei 2004

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