Learn what "tell me something i don't know" means, when people say it, and how to use it naturally in English.

He means the other person said something obvious, unhelpful, or not worth hearing.
From I Think My Wife Wants To Kill Me, Episode 57
He reacts with sarcasm, implying the other person has not said anything useful.
Use this as a sarcastic comeback when someone states the obvious. It is rude and can escalate an argument.
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