whack off

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whack off (third-person singular simple present whacks off, present participle whacking off, simple past and past participle whacked off)

1. (intransitive, transitive, slang) To masturbate.
   • 1969, Philip Roth, “Cunt Crazy”, in Portnoy’s Complaint, New York: Random House:

     Did I mention that when I was fifteen I took it out of my pants and whacked off on the 107 bus from New York?

   • 1979, William Styron, chapter 14, in Sophie’s Choice, New York: Random House:

     […] why is it that I am discomfited by the bizarre fact that the one thing she will do, though in a pleasureless and rather perfunctory way, is to whack me off hour after hour until I am a lifeless and juiceless stalk, exhausted and even humiliated by this dumb pursuit?

• See also Thesaurus:masturbate