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

The speaker is directly saying the other person is incompetent or making poor decisions.
From Good For Him, Episode 29
Someone insults another person by saying they are incompetent.
Use this in an argument or to criticize someone's actions, but it is rude and confrontational. It is common in heated conflict.
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