Muffin Head Share definition Flag Someone that is crazy and/or stupid. Mostly both. They're sometimes an idiot too.. (Kim Kardashian got a divorce after only 2 and a half months)Kim is a muffin head. Muffin Head by Diedrich Knickerbocker January 3, 2012 0 0 Get merch Get the Muffin Head mug. Buy Now — $32.95 See more merch