Frommouth +‎fuck.

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mouthfuck (pluralmouthfucks)

1. (vulgar, slang) An act ofaggressive,vigorousfellatio;irrumation.

mouthfuck (third-person singular simple presentmouthfucks,present participlemouthfucking,simple past and past participlemouthfucked)

1. (vulgar, slang) To aggressively and vigorously penetrate a mouth and throat; to practiceirrumatio.
   • 2007, Peter Jason,Unfaithful,page62:

     Mouthfuck me, Andrew!

   • 2007, Tom Dalzell, Terry Victor,Sex Slang,page119:

     ...mouthfuck...

   • 2011, David Hawthorn,My Daughter, My Desire: A Novella of Forbidden Lust,link:

     I started tomouthfuck my daughter hard, making cum squirt out of her tightly stretched lips.

2. (vulgar) Toscold someoneharshly.

• mouthfucker

• Random House Historical Dictionary of American Slang

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