flungdoo Share definition Flag The Martial Art technique of pooping in your own hand, and then flinging it violently at an adversary. I was about to beat the shit out of this dude, until I found out he was a master of "flungdoo"! flungdoo by Brendan Lawson July 20, 2008 0 0 Get merch Get the flungdoo mug. Buy Now — $32.95 See more merch