mormon third base Share definition Flag The act of cuddling, laying down on a bed, couch, futon, hammock, or love-sac. Also known as spooning. When I turned on the lights, I caught Brandon attempting to get to mormon third base with Cami. mormon third base by mormon_playa October 10, 2007 0 0 Get merch Get the mormon third base mug. Buy Now — $32.95 See more merch