Synonym Phrase: I'm about to roast on you.
Somewhat of a taunt or gloat.
Guy 1: "Hahaha! Is that fake Polo?"
Guy 2: "Oh you, tryna' roast? Bruh I'm on yo ass! Ol, high water, flipped collar, no dollar lookin' boy!"
Guy 1: "That's what yo momma said when she left last night!"
Guy 2: "Shut up man! yeen funny!"
Guy 1: "Hahaha! Boy I'm on yo ass!"