Bum Doily Share definition Flag A bum doily is a pretty pattern left by a rather bad explosion of fecal matter. Unlike most deal explosions, this one was quite pretty. It was a proper Bum Doily. Bum Doily by CheesyMilty March 18, 2020 0 0 Get merch Get the Bum Doily mug. Buy Now — $32.95 See more merch