fiesta bowl Share definition Flag (n.) the appearence of the toilet after pissing out your asshole (Poya), as a direct result of eating mexician food. I would have to admit that I turned the toilet into a fiesta bowl after eating that chile relleno. fiesta bowl by Houndz August 26, 2007 0 0 Get merch Get the fiesta bowl mug. Buy Now — $32.95 See more merch