look up any word, like tbt:
 
1.
The person everyone loves to hate and never wants to become.
You're driving and get stuck in the middle of the intersection just as the light turns red. Now, because of you no one can get by. You have now become "That Guy".
by Desiree April 16, 2005
 
2.
That Guy refers to a person who appears in the background of a photograph often without the consent or knowledge of the photogropher of subjects of the picture. That guy often takes the focus of the photo off the intended subject. That guy is often seen making a funny face or rude gesture, commonly a blowjob gesture. There is a category on college humor.com of That Guy pictures.
I took a picture of my friends at the beach but That Guy is right in the middle of it.
by cdizz July 23, 2006
 
3.
Anonymous co-worker in your organisation. Possibly frozen in time from the 1980s and the toast of Wall Street. He’ll be ready to sleaze his way to the top, 80s style! He knows about business and has a tie. Also went to a lot of coke parties. The secret to his success is all about appearances. Outside of the office he goes back to the farm, shifts some paradigms and revolutionises outside the box. Liked the Safety Dance and died from Boneitis.
“Who shall we pick to be our new CEO?”
“I nominate That Guy!”
by Lugs-o October 18, 2004
 
4.
The most annoying person at a social outing or gathering, especially when alcohol is involved.
Whatshisnuts- "Dude, So-and-so was being 'That Guy' at the party last night."
Theotherguy- "Yeah, especially when he kept screaming then telling people to shut up."

by MoStang June 05, 2007
 
5.
1. A male at a wedding or social gathering who is oblivious that he is making an ass of himself and embarassing everyone who knows him.
Dwayne was "that guy" at the wedding. He hit on 3 bridesmaids and vomited in the planter outside.
by Bud E Love May 05, 2003
 
6.
The guy who goes to a high school party after he's graduated high school.
i can't believe "blank" showed up didn't he graduate like 4 years ago
by Rob April 08, 2003
 
7.
1. (n.) The guy who wears the t-shirt of their own band. 2. (n.) The guy who wears the shirt of the band that he has come to the show to see. 3. (n.) The guy who buys a shirt at a show and puts it on over whatever shirt they were previously wearing.
Dude, don't be that guy.
by richbastard March 26, 2003