Muffin Butting Share definition Flag Muffin Butting is the act of inserting a muffin into ones rectum before expelling it through a bowel movement. I spent yesterday Muffin Butting and have been clearing crumbs out of my ass for hours. Muffin Butting by Forth3k4de October 12, 2016 0 0 Get merch Get the Muffin Butting mug. Buy Now — $32.95 See more merch