At the supermarket an elderly lady needed to pay one dollar at the counter. She mistook a hundred-dollar bill for a ten-dollar bill and gave the hundred-dollar bill to the cashier. The cashier returned nine dollars to her. The cashier ripped her off for ninety dollars!
rip somebody off for something「白吞」就是佔便宜的意思，如「超商店員白吞了一個老婦人的錢」。rip somebody off 是一個人吞另一個人的錢的最好的說法之一< >
I am much smarter than my husband, but it is important to proect his manhood.