Pisspotomus Share definition Flag A person that excessivly Pisses themselves, either in bed or their pants. Oh My Gawd, Your brother is such a Pisspotomus, ewe he passed out again and wet his bed. Pisspotomus by LocoSnowman April 24, 2009 0 0 Get merch Get the Pisspotomus mug. Buy Now — $32.95 See more merch