Hi! It's an informal expression (sarcastic? ).
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TanitHi!
It's an informal expression (sarcastic? humorous?). I think it means that you're either surprised or not by something you're being told. For instance:
- Have you heard John left Mary?
- You don't say! I've always known he has a crush on Julia!
- Have you heard John left Mary?
- You don't say! I thought they were going to get m