29
Someone who goes for younger girls, most often occurs with a large age difference, Someone who is just known to be that guy.
Dylan: Who's that guy who's always creeping on the grade 9's.

Lachlan: Thats me, Im that guy.
by y.m.c.m.b February 25, 2011
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30
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.
by BigK1D April 28, 2004
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31
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.
by lord May 11, 2004
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32
Term of brotherly advice, often given to oneself, to avoid acting like embarrassing dickwad as seen on YouTube or other social media.
“Did you see where Katherine Heigl’s husband got a tat with her zodiac sign and birthday?"

“Don’t be that guy.”

“Did you see where Rick Perry couldn’t count to three on the presidential debates?”

“Don’t be that guy.”
by Otisregrets November 24, 2011
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33
A person who constantly ruins jokes by repeating them, especially inside jokes that they were not a part of. He also is annoying and made fun of behind his back by all his friends. He tries to do stuff outside of the box, but wants to make sure everyone knows he is doing it by informing them in great unnecessary detail that is not needed and laughs half of the time he is explaining his dumb ideas. He sometimes may also score the hottest girl at your school some how and no one knows why. He may also try to join groups of friends uninvited.
Cool guy, "Hey guys y'all want to hang out this weekend"

That guy, "Yeah I'll be there for sure!"
Cool guy;, "Well we were kinda wanting it to be like just a couple of guys"
That guy, "Yeah don't worry I'll be there"

That guy, "Your mom!"
Cool guy (under his breath looking at his friend peripherally), "That was cool in 6th grade.."
by Flipper Gong September 07, 2011
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34
In pretty much every country around the world where drinking alcohol is a cultural norm, every single social circle includes at least one person who becomes "that guy" (plural: "those guys").

We all know of whom I speak: The one friend who makes himself stand out in all the wrong ways. He always gets absolutely trashed, and makes a COMPLETE tit out of himself.
"Yeah, my friend Dom just got chucked out of the union for getting his knob out in the middle of the dance floor before unloading his stomach onto the floor"

"Shit. Doesn't sound good".

"Standard. He can generally always be counted upon to be That Guy".
by Zarathustratosphere June 26, 2011
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