Learn what "what are you doing in here son" means, when people say it, and how to use it naturally in English.

It means what are you doing here, and often shows surprise or suspicion.
From The Marriage Contract, Episode 49
A man asks why someone is inside a room, showing surprise and concern.
Use this when you are startled to find someone somewhere they should not be. It can sound rude or confrontational depending on tone.
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