Trinidad James -- INSANE DUNK PROP ... At Celeb Hoops Event

This is awesome.

Rapper Trinidad James -- the "All Gold Everything" guy -- offered himself up as a prop for a RIDICULOUS dunk at a celeb hoops game in L.A. this weekend ... and TMZ Sports has the video.

It all went down at the Sneaker Drive and Celebrity Basketball Game at Crenshaw High ... where stars like Nipsey Hussle, Hit Boy and Problem raised money for underprivileged kids.

But the highlight was when pro dunk specialist "Young Hollywood" asked James to be part of his dunk show ... and what happened next made the crowd go berserk!