Happy Disaster Share definition Flag A Happy Disaster is when You take a shit and do not flush. Leaving it for the discovery of a good friend. I was at my buddys house for some mexican food after I ate I left him with a Happy Disaster. Happy Disaster by Tbagmartin April 15, 2010 0 0 Get merch Get the Happy Disaster mug. Buy Now — $32.95 See more merch