lose one's shit

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lose one's shit (third-person singular simple present loses one's shit, present participle losing one's shit, simple past and past participle lost one's shit) (idiomatic, vulgar)

1. To lose one's temper.
2. To have a sudden burst of emotion, regardless of the type of feeling.

   I watched Lady Gaga’s Telephone video last night, and I lost my shit.

3. To break down in laughter.

• hold it together