[ hwakt-out, wakt- ]
/ ˈʰwæktˈaʊt, ˈwækt- /

adjective Slang.

tired; exhausted; worn-out.
wacky; crazy.
stupefied or crazed by narcotic drugs or alcohol; stoned.

Origin of whacked-out

First recorded in 1965–70

Definition for whacked out (2 of 2)

Origin of whack

1710–20; orig. dial., Scots form of thwack; cf. whang2, whittle
5 try, go, turn.
Related formswhack·er, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for whacked out


/ (wæk) /

verb (tr)



an exclamation imitating the noise of a sharp resounding blow
Derived Formswhacker, noun

Word Origin for whack

C18: perhaps a variant of thwack, ultimately of imitative origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for whacked out



"to strike sharply," 1719, probably of imitative origin. The noun is from 1737. The word in out of whack (1885) is perhaps the slang meaning "share, just portion" (1785), which may be from the notion of the blow that divides, or the rap of the auctioneer's hammer.

Online Etymology Dictionary, © 2010 Douglas Harper

Idioms and Phrases with whacked out (1 of 2)

whacked out


Tired out, exhausted, as in They were whacked out after that long flight. [Slang; mid-1900s]


Crazy, especially under the influence of drugs. For example, She looked whacked out when the police picked her up. [Slang; mid-1900s]

Idioms and Phrases with whacked out (2 of 2)


In addition to the idioms beginning with whack

  • whacked out
  • whack off

also see:

  • have a crack (whack) at
  • out of kilter (whack)
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.