Learn what "stop behaving like a lunatic" means, when people say it, and how to use it naturally in English.

It is a harsh insult meaning the person is acting irrationally or wildly.
From The Pendleton Secrete, Episode 14
Someone angrily tells another person to stop acting crazy or irrational.
This is very rude and can escalate an argument quickly. Learners should avoid it in polite conversation or at work.
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