look up any word, like rockabilly girl:
 
36.
The one person who nobody likes and just has to ruin everyone's fun. Commonly seen being a douchebag while committing actions that are completely irrelevant to the situation.
Josh: Guys, I just found out I actually like football. I might keep playing if no stupid jackasses show up this time.
Doug: Oh God, here comes that guy.
That Guy: Sup guys. Any of you get laid yet? Josh, are you still a virgin? I'm gonna get you laid this summer.
Josh: That's it, I'm gone.
That Guy: Hold on, guys, I'm gonna fire up some mary-j for a minute. *starts puffing away on a joint*
by LeagueOfLulz June 24, 2011
 
37.
Co-Anchor to the Facebook show.. Bout that Life TV.. thee name is Kevin Collins you already know dude knows what lifes about... let that thang wobble yerd
Your "that guy" when you go back after that girl
by Yerd September 17, 2010
 
38.
a phrase used to describe a person at a party who tries to start drama, fight people, say gay things to other guys, or just makes an ass of himself.
bro1: dude johnny is downstairs trying to fight everyone and he told me that i was the sexiest man alive......

bro2: he's "That Guy" tonight
by bromontana179010 February 20, 2010
 
39.
The one guy in a crowd that does what everyone expects someone to do
He is that guy that says "cha, cha, cha" in the pauses in Happy Birthday
by SNOWPLOWMC June 16, 2009
 
40.
That guy is one who attends a party only to take advantage someone's drunk girlfriend. Now not only did you ruin her life, but you also pissed off her boyfriend likewise all for your own greed. Perhaps this can be a tactic for vengeance, perhaps you are just a douchebag. Whatever the case, you are now "that guy"
Hungover college student: OMG OMG OMG, I totally shouldn't have slept with "that guy" last night! What if my boyfriend finds out? He'll probably beat me and none of it was even my fault!

Friend: About that... he was also at the party.

Hungover college student: O_O
by A rabid chicken November 18, 2010
 
41.
(n.) A male notorious for his artistry in seducing the fairer sex.
Katie, despite her adamant claims, was beguiled when she met that guy beneath heaven's starry canvas.
by theFlannelVillain June 17, 2010
 
42.
(n.) The guy who walks around only killing his own team mates while playing video games.
That guy who kills you everytime you cross his path during Halo
by Hencakes December 17, 2008