flap crapper Share definition Flag a man that derives sexual gratification from defecating on his partner's labia she discovered colin was a flap crapper when she woke one morning to find she was having intercourse with a gigantic turd flap crapper by theWestHamfan January 12, 2004 0 0 Get merch Get the flap crapper mug. Buy Now — $32.95 See more merch