oh boy

From Wiktionary

Interjection[change]

Interjection
oh boy

  1. You use oh boy when you are excited about or looking forward to something.
    Oh boy, ice cream!
  2. You use oh boy when you are displeased or dreading something.
    Oh boy, here we go again.

Usage[change]

The positive meaning is usually said with rising intonation, while the negative meaning is said with falling intonation.