Eat Sack Share definition Flag Telling someone to nibble on or to eat the scrotum or the ball sack of another man. Ian : Man you suck at call of Duty. Mark : Hey Ian, Eat Sack. Eat Sack by EatSackMan December 1, 2010 0 0 Get merch Get the Eat Sack mug. Buy Now — $32.95 See more merch