oh girl

Interjection

 * Oh, girl! I can't wait to tell my friends about this!
 * Oh, girl. This is going to be a lot of work.
 * Oh, girl. Now what do I do?
 * Oh, girl. Now what do I do?

Usage notes
This use of the expression is relatively rare compared with the sum-of-parts use, which is addressing someone the speaker is calling "girl". It is typically used by someone who is also making a point about gender, since the more common phrase is.