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Phrase Meanings » whack off
What does "whack off" mean?
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Cut off, as in The cook whacked off the fish's head with one blow, or The barber whacked off more hair than I wanted him to. [Slang; first half of 1900s]
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Masturbate, as in He went to his room and whacked off. [Vulgar slang; mid-1900s]