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

It means the speaker claims the other person is making no sense or talking about something unclear.
From I Think My Wife Wants To Kill Me S2, Episode 14
He says he does not know what the other person is talking about.
Use this to reject an accusation or dismiss a confusing claim. It can sound rude or confrontational, especially in British English.
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