Slap-shut Share definition Flag To non-abusively, but verbally, smack the shit out of somebody. "Ima Slap-shut yo bitch ass." "Eric slap-shut his mother cause she wouldn't make him a sandwich." Slap-shut by Dylan&Sam December 7, 2007 0 0 Get merch Get the Slap-shut mug. Buy Now — $32.95 See more merch