Port-A-Pisser Share definition Flag Making a bathroom in/on/by somthing that is not a bathroom, Like the side of a house or fence. Going to use the Port-A-Pisser, then walk around the side of the house use the bathrrom and come back. Port-A-Pisser by Nebraska Girl October 2, 2011 0 0 Get merch Get the Port-A-Pisser mug. Buy Now — $32.95 See more merch