D and T are the fourth and twentieth letters in the alphabet, thus, DT stands for 420. It is commonly used to cover up when one or a group are about to smoke and there is heat*(see "heat") around, such as parents, teachers, cops, and employers. If questioned, it can be easily covered up as slang as well. (downtown, etc.)
"Yo, i'm hurtin'. Time for DT?"
"Uh, let's go sm...DT."
Designated Talker for the orally impaired. i.e. Colin Field
DT where'd you hide my beer.
wow wow wow DT DT...
Instead of the usual, "dtf" (meaning, "down to fuck"), dts simply means, "down to shnarky" while shnarky means anything from a simple kiss all the way to sexual intercourse and all the kinky things you could imagine inbetween.
Boy to Girl 1: (;
Girl 2 to Girl 1: He used a winky face... I think he's dts.
Girl 1 to Girl 2: Hmm, alrighty then...
Girl 1 to Boy: You wanna shnarky?