short for "Dare To Game"
DTG is an online community which revolves around a web-based RPG set in the post apocalyptic earth were five races fight to be the next leader of earth.
Joe, I'm bored, let's play some DTG
Ashley got caught in C# class playing on DTG
In other words it is asking the intended listener whether or not he/she is willing to smoke marijuana with them.
Nilz - "Bro I'm always down!!"
Josue: Hey I met this 70 year old guy from California yesterday.
Antonio: Oh cool, was he DTG?
Josue: No unfortunately he wasn't. I wish I was like Pat so I could just force people to grip up with me whether they want to or not.
Usually used by awkward drunk white guys.
Girl: ewww!! get away from me you creep!
Guy 2: You wanna play?
Guy 1: Yeah i'm dtg
Guy 2: Sweet lets play
sitting in bed playing taylor swift crying your eyes out because your lifes not perfect