Cereal Grapist Share definition Flag An individual who tends to add grapes to his or her cereal for breakfast. My lucky charms were topped with so many grapes, my little sister called me a cereal grapist. Cereal Grapist by Jack Mehoff II August 1, 2008 0 0 Get merch Get the Cereal Grapist mug. Buy Now — $32.95 See more merch