Wormass Share definition Flag N: a person who is grimy and slimy in the way they act or look. They're usually sneaky about things pertaining to dating or getting things. That guy who was trying to take you home last night was such a wormass! Wormass by PopBottles77 August 22, 2008 0 0 Get merch Get the Wormass mug. Buy Now — $32.95 See more merch