Comes from the land of Nagro , circa 1965 , presently used by all , to bust , bussa and bussin a nut(s) , usually accompanied by ,bitch , im out yo pussy when i nut , for real
Bustin means that somethings ugly, weird, wrong, or boring as shit. A party could be bustin. You could be bustin. Basically anything could be bustin if it fits the criteria for being bustin. (Just a little note: things could be bustin ot busted)
"Bro this bud is on whack rn."
"Yeah bro. This shits bustin."