muffi Share definition Flag A much more suitable plural form of the word "muffin." Why is it more suitable? It looks much cooler than the word "muffin," plus it is damn fun to say! "Man, those muffi were delicious this morning!" muffi by Nich-o-Las April 2, 2008 0 0 Get merch Get the muffi mug. Buy Now — $32.95 See more merch