All Yack Share definition Flag A guy or girl who has the mentality that they are extremely attractive, all that, but are in fact the opposite. Quanita be thinkin she all that, but she be All Yack! All Yack by Todd Higginbotham November 8, 2004 0 0 Get merch Get the All Yack mug. Buy Now — $32.95 See more merch