adjective: anything nice, raw, cool, positive, of that nature
can be used as a confirmation, okay, yes, and thank you.
Derived from Miami native Jeffrey Molina, a shortened version of the phrase "good shit" made to be less explicit.
Man 1: Did you see that MILF
Man 2: Yee she was gushi.
D WADE *throws an alley to Lebron*
Bron: *Looks at DWADE, nods* Gushi!