When we say that a person ' blew his top ', what do we mean?

blow one's top的意思是（變得非常憤怒）（Cambridge Dictionary online就有以下的解釋：to become extremely angry.
如：
My father will blow his top when he sees what happened to the car.
（當他看到車的樣子，我的父親會很憤怒）
希望幫到你！

是發老脾,痴咗線的意思,是informal用法,是idioms來的,其定義如下: A. to become enraged,lose one's temper. B. to go mad ,become insane.例句: He must have blown his top to make such a fool himself.佢一定係痴咗線先至會做出d甘愚蠢 ga 事.

'blew his top' means
吹虛及炫耀自己