whack off

whack off idiom
  1. 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]
  2. Masturbate, as in He went to his room and whacked off. [Vulgar slang; mid-1900s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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