flap-a-caping Share definition Flag When a person cant pronounce their words correctly and their words run together. Did you notice how bad Bob was flap-a-caping today? I couldn't understand anything he said! flap-a-caping by Diana66 April 19, 2018 0 0 Get merch Get the flap-a-caping mug. Buy Now — $32.95 See more merch