Yackle Share definition Flag A word usually said when something is funny or just becuase you want to say it. Also can be used as another form of yeah. "Dude did you see that movie yesterday?" "Yackle"or"Thats what she said!" "hahaha yackle" Yackle by xxxtheraptorxxx February 6, 2010 0 0 Get merch Get the Yackle mug. Buy Now — $32.95 See more merch