(oh) (my) God!
An exclamation of surprise, alarm, dismay, annoyance, or exasperation. My God, look at the time! How is it nearly midnight already? God, Bill! Would it kill you to take out the trash once in a while? Oh my God! That cyclist nearly hit me!
my God
An interjection denoting shock, distress, or surprise. My God, that car almost ran off the side of the road! My God, is that you, James? I haven't seen you in 20 years!
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.
my God
Also, my goodness. Expressions of shock, surprise, or dismay, as in My God, don't tell me he's dying, or My goodness, what an awful outfit. The first term dates from about 1800; goodness in the variant is a euphemism for God.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.