2
general::
Phrase(s): My(, my).
an expression of mild surprise or interest. • Fred: My, my! How you’ve grown, Bill. Bill: Of course! I’m a growing boy. Did you think I would shrink? • Doctor: My, my, this is interesting. Jane: What’s wrong? Doctor: Nothing that a little exercise won’t fix.
McGrawhill's American Idioms And Phrasal Verbs