Lin Yutang
According to Lin Yutang, the expression comes from "pīpàn" (, 'to criticize and judge') and "dòuzhēng" (, 'to fight and contest'), so the whole expression conveys the message of "inciting the spirit of judgment and fighting." Instead of saying the full phrase "pīpàn dòuzhēng", it was shortened to "pīdòu" ().