The southern Fujianese are masters of making examples out of turtles. It is said that the turtle belongs to the element of water, and that water represents money (because of the expression that runs "one will hit it rich when meeting water." And so "knocking the turtle over" is used to describe money running out, and has been a very common expression among Taiwan's gamblers in recent years.
據說因為烏龜在五行中屬水，代表錢財，「遇水則發」嘛，因此「槓龜」﹘﹘打翻烏龜，就被用來形容錢財飛了，也成為近年來賭風盛行的台灣最熱門的用語。