Dictionaries:
Sexual DictionaryDictionary of the F-Word

fuck (someone's) brains out:

Or: fuck-(someone's)-ass-out Since the 1950s, to engage in prolonged and/or vigorous copulation with (someone).
QUOTE: 'In English, I'll fuck your brains out.' Kathryn (Sarah Michelle Gellar) in Cruel Intentions (1999)

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