Butt Cactus Share definition Flag An alternative to describing a person of being a pain in the ass "Geez, leave it alone. You're being such a butt cactus - I'll get it done." Butt Cactus by Vegas Bitch February 19, 2009 0 0 Get merch Get the Butt Cactus mug. Buy Now — $32.95 See more merch