tear的意思是"扯出"或者"拔出。tear one's hair从字面上看，意思是"拉扯"头发，但实际上表示勃然大怒。这个说法有着悠久的历史渊源。两千多年前在希腊古典剧场里，演员往往通过把头发一把把地扯下来，来表达不胜愤怒或者痛苦不堪的感情。

【例句】
I told the kid a hundred times to be careful with the car, so when I saw him come back with the front all bashed in, I tell you I was mad enough to tear my hair.
我不下一百次地告戒那孩子：要小心开车，所以当我看到他开车出去把车头全撞坏了回来，简直把我气得要发疯。

His behavior and attitude really tore my hair.
他的行为和态度让我勃然大怒。