Shave Slap Share definition Flag Slapping someone after they shaved. This is the same as slapping someone after they've had a haircut. My brother got a shave slap from me after he shaved his full grown beard. Shave Slap by CaptainGill April 3, 2011 0 0 Get merch Get the Shave Slap mug. Buy Now — $32.95 See more merch