This is a person that is pretty much a sarcastic asshole and/or a slightly balding fuck. They try to make you laugh by tellin terrible jokes about some dead guy that nobody gives a flyin fuck about in the first place. They cant stop talking about needless things in life.
Q: Hey i am trying to think of a description for Mr. Griffin. Can you help me?
A: Yeah man thats easy. He is That Guy.
Q: Isn't that kinda harsh?
A: Nah man he meets the description perfectly.

Example #2

Trinite's are as a whole "that guy"
by NotThatGuy2015 January 14, 2011
Someone who's always calling a girl, or IM-ing her, or running into her at a bar. He always flirts with her -- and even thinks he has a shot -- even though she's made it perfectly clear that she's not interested. Not as malicious as a stalker, just annoying.
Ugh, that guy called me AGAIN.
by Leefy Greans January 11, 2006
"That Guy" is the guy that you know of, but do not know personally. You see him at the bowling alley every week and he is just the sliest old man you've ever met. That guy has bowled 300's on several occasion which makes you want to know him even more. He's an asshole and as much as you want to hate him you cant, because he's THAT GUY. Just when you think you've had enough of THAT GUY, he openly makes fun of a person you dislike and he draws you in even further.
Morgan Freeman: "Look, someone is about to bowl another 300 game!"
Edward Scissorhands: "It's THAT GUY! Man, I hate him"
Morgan Freeman: "No you don't"
Edward Scissorhands: "You're right, I love THAT GUY"
by Moe0618 October 09, 2012
That Guy is the baddest motherfucker on this earth, you can usually hear about him in tv shows when the main characters are jealous because "That Guy's getting laid by those two gals tonight" or "That Guy actually bought Playboy Mansion".

An easy mistake to make is hear about "that guy" and believe people are referring to "That Guy". The two are polar opposites, one being the pinnacle of awesome and the other being a retarded pussy that frequent parties orchestrated by 15 year olds.

While That Guy is pretty cool, he's also an elitist asshole, so you're probably not his friend unless you're easy and pretty hot, in which case you're not reading this.
-"That Guy just made it with her"
-"What? But she's my (trophy) wife!"
-"Apparently That Guy doesn't care much for the bonds of marriage"
-"Neither do I but I'm an old rich man!"
-"I hear your wife's on redtube now"

That Guy taking from the rich and giving back to the poor.
by Metal308 October 03, 2009
An Overall average looking guy, that dresses simply with a boring personality that is dating the hottest girl in the room.
Guy1: What does she drink? Pointing to a girl
Bartender: Be Careful she's sitting with her boyfriend
Guy1: ThatGuy? She's Dating Him? Really? Ok
by Jacob R. Daugherty December 24, 2008
(n)A person who makes a fun occasion awkward or otherwise boring by being the one guy to disagree with the majority; a person made into an outsider by his ridiculous antics.
(v) being That Guy on any occasion; Being made into an outsider by your ridiculous antics.
"dude look at Rick"
Rick-(proceeds to tell the girl he just met about the history of Judaism)
"Oh god he's become that guy"
"Should we leave him?"
"Yeah, he's already too far gone."

"Bob, you've been That Guying on several occasions for a while now, we all just want the old Bob back!"
Bob-"you guys just don't understand! I REALLY LIKE NINE INCH NAILS!"
Rest-"oh god he just That Guyed so hard it gave me ASL"
by JackJackAttack September 21, 2014
He fools you once, you're mad. Fools you twice, how could he. Fools you three times and he's officially that guy, you know the one. He goes to the bar and he's like "This suit is officially Georgio Armani, my dad knows him", FUCK YOU. I AAAAAIIIIINN'T HAVIN THAT SHIT!
Nightshade is officially that guy
by Unknowni123 July 29, 2013

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