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

This means the speaker believes the other person is wrong or uninformed.
From Destined To Be, Episode 3
A speaker dismisses what the other person is saying during an argument.
Use this in a heated argument, but it sounds rude and insulting. It is not appropriate in polite conversation or at work.
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