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1.
ATG
Ass-to-Grass. A type of squat in weight lifting where one goes as deep as possible.
1)I'm squatting ATG today for 5x5.
2)If you want to get swole, you gotta squat ATG!
by Mr. Deeds October 24, 2006
 
2.
ATG
ATG (Anti-thymocyte globulin or AtgamÒ) is a medicine used prevent rejection in different types of transplantation, treatment of graft versus host disease and in certain patients with aplastic anemia. It does this by suppressing the body's own immune system. It is available as an injectable medication.
Got some shitty news about the ATG tonight. It's not working.
by q February 01, 2005
 
3.
ATG
ATG=Any Thing Goes. Usually said in conversation before a crazy night out with someone.
"what you wanna do tonight?"
"Idk, ATG."
"Aright that's cool with me"
by NervousClassGoerSaysRoar September 06, 2012
 
4.
All that good shit
Used in IMing during online video games, for example, GL, HF, ATGS
by iluvthtre July 27, 2008
 
5.
ATG
abbreviation for 'at the gym'
brb lol atg.
by trano December 27, 2011
 
6.
ATG
Aren't Tits Great?

Use to compliment an excellent pair of jugs.
<While ogling at a pair>...
"Dude, ATG, man, ATG!"
by Geoff December 15, 2004