Mcnuffin Share definition Flag When a mcdonalds worker gives you a mcmuffin but forgets to put anything on the inside resulting in just 2 tiny ass muffin buns I couldn't satify my hunger need because that dumb mother fucker gave me a Mcnuffin Mcnuffin by Tsidders June 28, 2009 0 0 Get merch Get the Mcnuffin mug. Buy Now — $32.95 See more merch