muffin Share definition Flag Something that J.G and R.S wanted me to make a def of. Also slang for a cunt. i.e Cunt muffin I cant belive I have to do a def for muffin! God, that guy is such a Cunt Muffin. muffin by rach April 7, 2005 0 0 Get merch Get the muffin mug. Buy Now — $32.95 See more merch