Lord!

(oh) Lord

An oath expressing surprise, shock, frustration, anger, or annoyance. Oh Lord! If we'd stopped the car one second later, that train would have hit us! I know you've had a long day at work, but Lord, is it too much to ask for you to take out the trash?
See also: lord

(good) ˈLord!

,

oh ˈLord!

used to show that you are surprised, annoyed or worried about something: Good Lord, what have you done to your hair!(Some people may find these idioms offensive.)
References in classic literature ?
Yes, my lord! They are extremely fortunate in that respect.
"That which I have to say of her can only be heard by yourself, my Lord!"
"You will not sign that order, my Lord!" said Felton, making a step toward the duke.
"Oh, my Lord!" cried the baron, "I shall never console myself."
"Take control, Lord! We ask for additional vacancies on the court, and we ask for additional fine people like John Roberts.