b-sak Share definition Flag another, cleaner (less foul) way to say ballsack, incase you happen to be around family, the elderly, or small kiddies Dude way to go..you hit that girl on the ass,and she thought it was me..so she hit me in the b-sak b-sak by evan April 15, 2008 0 0 Get merch Get the b-sak mug. Buy Now — $32.95 See more merch