fire piss Share definition Flag A burning sensation when urinating after drinking an exceptional amount of liquor, or sometimes for no reason at all... like i just did Shit man, usually I get fire piss when I drink a 40, but this was a complete blindside. fire piss by Andyk028 October 5, 2006 0 0 Get merch Get the fire piss mug. Buy Now — $32.95 See more merch