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Refers to da sarcastic expressing of one's lack of respect for a particular fellow human by either braying like a donkey or mooning him.
An "ultimate" or "deluxe" form of ass-sassing someone would be if you are able to "train" your sphincter --- i.e., learn to precisely tighten or relax your butt-muscles during flatulence to make your farts "toot" at different pitches --- to hee-haw; that way, you can both drop your pants in da direction of whomever you are ridiculing AND give him a nice loud raspy-raucous "mule-whinney" at da same time.
by QuacksO April 01, 2020