mgmm Share definition Flag When you're trying to agree with someone with water in your mouth and you choke on it mid mhmm because of the dumb shit that person just said Person: Hey, do you think fish feel? You: Mgmm. What? mgmm by Shister420 November 11, 2018 0 0 Get merch Get the mgmm mug. Buy Now — $32.95 See more merch