slopp cack Share definition Flag The art of slapping a pissed girlfriend across the face with your cock. Such a person may be referred to as a "slopp cacker". Slopp cack me harder you slopp cacker! slopp cack by Matt.M. January 14, 2008 0 0 Get merch Get the slopp cack mug. Buy Now — $32.95 See more merch