Slug Day Share definition Flag The day after Christmas, where you make a "slime trail" from the couch to the fridge, while watching the movies you received as presents. We celebrated slug day by watching TV and finishing off the leftover Christmas cookies. Slug Day by jghdghsdfhgsg June 4, 2010 0 0 Get merch Get the Slug Day mug. Buy Now — $32.95 See more merch
