good grief!

good grief!  {interj.},  {informal}

Wow! Indication of surprise, good or bad.

"Good grief," Joe cried out loud. "Is this all you will pay me for my hard work?"

What a figure Melanie has, good grief! I wonder if she would be willing to go out with me.

Compare:

GOODNESS GRACIOUS!,

HEAVENLY DAYS!,

HOLY CATS or

HOLY COW or

HOLY MACKEREL or

HOLY MOSES.

See: GOOD NIGHT (2).