That guy is the guy who does things for the girl hes with or the girl he likes in gratitude of her actions with him.
Cam: I want a massage.

Micki: I will give you a massage.
Cam: I will give you one back, I'm just That Guy.
by JesusCam August 12, 2014
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
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
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
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