User of the phrase: is about to begin or is already in the process of joking about/
dissing the receiver of the phrase.
Synonym Phrase: I'm about to
roast on you.
Somewhat of a taunt or
gloat.
Example 1
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!"
Example 2
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!"