number 81 Share definition Flag Taking a piss in a urinal with your Pants all the way down to your ankles I walked into a public restroom in this fat ass was taking A Number 81 with his pants down to his around his ankles number 81 by Biker44 November 24, 2017 0 0 Get merch Get the number 81 mug. Buy Now — $32.95 See more merch