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?