Learn what "what does he think he's doing" means, when people say it, and how to use it naturally in English.

It means the speaker is questioning someone’s behavior, usually because it seems wrong or ridiculous.
From Trial Marriage to A Billionaire, Episode 28
Someone reacts to another person’s behavior with disbelief or criticism.
Use this in an argument or when you want to challenge someone’s actions. It can sound hostile if said sharply.
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