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 is a rude way to say the other person is wrong or uninformed.
From Good For Him, Episode 3
Someone angrily dismisses the other person's opinion as uninformed.
Use it in arguments only if you want to sound strong or insulting. It is common in drama but rude in real conversation.
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