buttanus Share definition Flag An exclamation of disgust using a contraction of Butt and Anus. Sometimes used as a noun to describe an unsavory fellow. Pronounced like "Bananas". "That movie was buttanus!" "That guy is a total buttanus" buttanus by CappyJmog May 17, 2006 0 0 Get merch Get the buttanus mug. Buy Now — $32.95 See more merch