An acronym which stands for "down to booyah"
This is typically said either between two sexual partners who would be booyaing, or between friends to say, "f'sho, let's do it."
BOOYAH:
("A exclamation used when a males genitalia are removed from a female orifice smaller than the genitals creating a suction and subsequent popping sound."
by TheManDanIsCool)
CAITLIN: I think I wanna go to Wendy's for lunch.
NATHAN: Yah?? You DTB?
CAITLIN: Eww..no.
NATHAN: No, I mean LETS GO!!!