piss fart Share definition Flag Metonymy for toilet humor, based on the punchlines of scatalogical jokes. "South Park is like the Howard Stern Show in that it's the same thing. Here it is: Piss fart. Great." piss fart by johnjohnjohnjohn April 2, 2008 0 0 Get merch Get the piss fart mug. Buy Now — $32.95 See more merch