cactus ass Share definition Flag A prickly, fiery burning in the rectal cavity during the act of defecation, as though one were passing a cactus through the colon. Remind me not to get the Inferno Burger next time we go out to eat; that gave me mad cactus ass. cactus ass by Dodger of Zion November 19, 2010 0 0 Get merch Get the cactus ass mug. Buy Now — $32.95 See more merch