by the hair of my chiny chin chin意思是?

呵呵原句是,故事三只小猪--《Three little pigs》里三次,狼来敲门时,每只小猪都说的话,狼和小猪的对话是：
The wolf said,"Little pig,little pig,let me come in."
To which the pig answered,"No,no,by the hair of my chiny chin chin."
“No,no,by the hair of my chiny chin chin.”相当于：(and no,I don't have any hair on my chin,ew)!即中文的（不,我的下巴没有长头发）
这句是运用诙谐的说法,意思是,不,那是不可能的事.（我不会开门的）
所以有时人们说by the hair of my chiny chin chin意思是“那是不可能的事”.