Flood Butt Share definition Flag a far more liquid case of mud butt where one's shit seems more like piss coming out of your ass. Oh, shit! Stop the car! I've got flood butt like a mother fucker!! Flood Butt by Mikel B July 12, 2006 0 0 Get merch Get the Flood Butt mug. Buy Now — $32.95 See more merch