English phrase from drama scenes

What Does "you don't know what you're talking about" Mean?

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

Beginner
Rude
Harsh
Confront

You don't know what

This is a rude way to say the other person is wrong or uninformed.

From Good For Him, Episode 3

When do people say this?

Scene Context

Someone angrily dismisses the other person's opinion as uninformed.

Usage Scenario

Use it in arguments only if you want to sound strong or insulting. It is common in drama but rude in real conversation.

Better ways to say it

1
You don't know what you're talking about!
2
You have no idea what you're talking about.
3
You're talking nonsense.

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