Boopy-Poopy Share definition Flag n. Unpleasant feeling fecal release resulting in a large amount of backsplash. Man Jorge, I'm all boopy-poopy after eating those nachos last night. Boopy-Poopy by M4 V February 2, 2009 0 0 Get merch Get the Boopy-Poopy mug. Buy Now — $32.95 See more merch