wack

1
[ wak ]
/ wæk /
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
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British Dictionary definitions for wacker

wack

wacker (ˈwækə)

/ (wæk) /

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