(oh) (my) God!

(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!
See also: god
Farlex Dictionary of Idioms. © 2015 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.
See also: 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.

(good) ˈGod

,

God alˈmighty

,

God in ˈheaven

,

my/oh ˈGod

(spoken) used for expressing anger, surprise, etc: Good God! What on earth have you done to my car?Oh my God! I’ve broken my watch again!God almighty! You’re not going to wear that terrible old suit to the wedding, are you?(Some people find these expressions offensive.)
Farlex Partner Idioms Dictionary © Farlex 2017
See also: