Yak in the sack Share definition Flag The point when your sack touches the cold water, when walking into the sea. "RAAAAAAH!!11" -"..." "OMG DUDE! RAGING YAK IN THE SACK!121" Yak in the sack by BAFNEQUE November 15, 2009 0 0 Get merch Get the Yak in the sack mug. Buy Now — $32.95 See more merch