barbecue slap Share definition Flag When someone puts barbecue sauce on the backside of their hand and then procedes to slap a unsuspecting person in the face with it. did u see that poor kid...donnie drugs just gave him a barbecue slap right to the face! barbecue slap by bevaloosa May 1, 2006 0 0 Get merch Get the barbecue slap mug. Buy Now — $32.95 See more merch