ohmgnom Share definition Flag An expression made when one's taste buds have been delighted. It is a combination of "OHMyGod" and a shortened version of "Nom Nom Nom". What do you think of the Life Cereal, Mikey?Mikey: Ohmgnom!He likes it! He really likes it! ohmgnom by leporinis August 23, 2011 0 0 Get merch Get the ohmgnom mug. Buy Now — $32.95 See more merch