Whack my Gack Share definition Flag A way of someone to say masturbate my penis. Jim: Hey you, why don't you come over here and Whack my Gack!? Tim: That is quite rude. Whack my Gack by Popaius November 8, 2016 0 0 Get merch Get the Whack my Gack mug. Buy Now — $32.95 See more merch