poopgasm Share definition Flag The act of orgasming when excreting an extremely large stool of waste or when explosive diarrhea is occurring. Man i just had the biggest poopgasm ever. My stool was easily 9½ inches long. poopgasm by rb45 July 29, 2005 0 0 Get merch Get the poopgasm mug. Buy Now — $32.95 See more merch