Learn what "don't tell me" means, when people say it, and how to use it naturally in English.

It means the speaker is jokingly annoyed that someone else did something first.
From Married To My Brother’S Ex, Episode 20
Someone reacts to a competitive or boastful situation with a teasing challenge.
Use it playfully with friends when you want to sound competitive or lightly annoyed. It may sound odd if the context is unclear.
Scenes unlock real expressions as you watch
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