This is typically said either between two sexual partners who would be booyaing, or between friends to say, "f'sho, let's do it."
("A exclamation used when a males genitalia are removed from a female orifice smaller than the genitals creating a suction and subsequent popping sound."
NATHAN: Yah?? You DTB?
NATHAN: No, I mean LETS GO!!!
Guy1 to Guy 2: dtb?
Guy2: sure, gimme a min.
Guy2 to Guy3: hey man me and a few others are dtb, u in?
Guy3: Fuck yeah, lez bang!