fuck someone's brains out

• hump someone's brains out

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fuck someone's brains out (third-person singular simple present fucks someone's brains out, present participle fucking someone's brains out, simple past and past participle fucked someone's brains out)

1. (idiomatic, vulgar) To sexually penetrate (or be penetrated) in a voracious but pleasurable manner.
   • 2013, Terence Winter, The Wolf of Wall Street, spoken by Jordan Belfort (Leonardo DiCaprio):

     I fucked her brains out… for eleven seconds.

• Jonathon Green (2024) “fuck someone's brains out v.”, in Green’s Dictionary of Slang