wack

1
[wak]Slang.

noun

adjective

very bad: All drugs are bad, but crack is wack.
extreme; far-out.

Origin of wack

1
First recorded in 1935–40; perhaps back formation from wacky

wack

2
[wak]

verb (used with or without object), noun

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for wack

wack

wacker (ˈwækə)

noun

Liverpool and Midland English dialect friend; pal: used chiefly as a term of address

Word Origin for wack

perhaps from dialect wack or whack to share out, hence one who shares, a friend
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 wack
n.

"crazy person," 1938, back-formation from wacky. Adjective in slang sense of "worthless, stupid," is attested from late 1990s.

Online Etymology Dictionary, © 2010 Douglas Harper