bum drizzle Share definition Flag Bum Drizzle: A leakage from the rectum of a small amount of diarrhea, often during the process of farting. "I was walking to the shops but had to run home once i felt some bum drizzle" bum drizzle by Piggidy November 25, 2007 0 0 Get merch Get the bum drizzle mug. Buy Now — $32.95 See more merch