whack off

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 (wăk, hwăk)
v. whacked, whack·ing, whacks
1. To strike (someone or something) with a sharp blow; slap.
2. Slang To kill deliberately; murder.
To deal a sharp, resounding blow.
1. A sharp, swift blow.
2. The sound made by a sharp, swift blow.
Phrasal Verb:
whack off Vulgar Slang
To masturbate.
have/take a whack at Informal
To try out; attempt.
out of whack Informal
Improperly ordered or balanced; not functioning correctly.
whacked out Slang
1. Exhausted.
2. Crazy.
3. Under the influence of a mind-altering drug.

[Probably imitative.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

whack off

(intr, adverb) slang to masturbate
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

w>whack off

vi (sl: = masturbate) → wichsen (sl), → sich (dat)einen runterholen (inf)
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007
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References in periodicals archive ?
AB's whack off seamer Waqas Maqsood was smartly held at the boundary as Salt moved back, jumped up over his left shoulder to grab the ball head high with both hands.
You can use broken branches and limbs, trimmings from your woodworking projects, or just take some of your firewood and carefully whack off small chunks with a manageable hatchet or a small axe.
He said: "The day itself was just to whack off a couple of small things.