matzah ass Share definition Flag A girl with a flat ass can be described as having a matzah ass, like in the form of flat unleavened bread. Vin: Yo, Mike look at that girls ass. Mike: Bitch's ass don't got any yeast, bitch got a matzah ass matzah ass by Mike McG July 3, 2008 0 0 Get merch Get the matzah ass mug. Buy Now — $32.95 See more merch