"That guy" refers to the narcissist inside each and every man. "He" is "That guy" when he gives into the urges (usually pertaining to sexual gratification) to the detriment of those around him. Nobody wants to be "That guy".
Bob: "Dude... don't freak... I got a blowjob from your sister last night ... but I don't want to be 'That guy'".

Another Bob: "Look at 'That guy' next to 'prince cassius' in the fashion section of the evening standard".
by jeffreythefarmer2 August 17, 2010

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(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

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1. The guy who is always the first person to be everywhere.
2. The guy who is always the first to point out something that everyone else is too shy to mention
3. The guy who simply tries to hard to fit in with the crowd.
1. Tyler was the first one at the party, he had to be that guy.
2. Well i didnt want to be that guy to point out that your fly was down.
3. Derek tried way to hard to impress us, hes just that guy.
by Green Machine 10 October 17, 2007

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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"
by that guy definer January 15, 2014

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The player that got you... and your friends.. and everyone.. but you still like him secretly.
That guy kissed me yesterday! But then when I got home I found out he was goin out with the new girl.
by mezougel December 11, 2010

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The guy everyone talks about.

The guy everyone would want to be friends with.
The guy everyone wants to hate on.
The guy everyone wants to be.
All of the above.
Man, who's that guy? I hate how he thinks he's the shit... lets be his friend!
by yoshi123456789 August 17, 2010

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The awkward guy nobody knows who inexplicably makes weird faces in the background of every picture.
Girl: Look how cute our prom pictures are!
Boyfriend: Yeah, except for That Guy.
by skittlesbunnyx3 July 10, 2008

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