Tuna Can Doo Share definition Flag An unusually wide piece of poop, shaped like a tuna can, that leaves your ass feeling gaped after shitting. "My ass felt violated after that Tuna Can Doo." Tuna Can Doo by Cous Cous June 7, 2009 0 0 Get merch Get the Tuna Can Doo mug. Buy Now — $32.95 See more merch