Learn what "i didn't even hear you come in" means, when people say it, and how to use it naturally in English.

It means the speaker did not notice the other person entering the room.
From I'M Obsessed With My Boss Part I, Episode 32
The speaker reacts casually after someone enters without being noticed.
Use this when someone arrives quietly and you want to comment on it naturally. It is casual and common in everyday speech.
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