A hoe down is an action that can either be a ho (hoe) falling or the folk dance of western hillbilies. usualy dances in a square or an unorganized mob of people.
In the game Yahtzee, all five dice displaying the same number is a Yahtzee. When someone get's 3 Yahtzees in one game of Yahtzee, it's called a hoe down. (Similar to 3 strikes in bowling being called a Turkey )