Used in IMing during online video games, for example, GL, HF, ATGS
by iluvthtre July 27, 2008
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ATG stands for Autistic Tongue Group. People who stick their tongues out when they take selfies are classified as an “ATG”.
You’re now officially an ATG for taking a selfie with your tongue sticking out.
by cherryvaginaslayer December 31, 2018
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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
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