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A person regarded as eccentric.
adj. wack·er, wack·est
Very bad: walked out of a really wack movie.
[Back-formation from wacky.]
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.
dialect Liverpool and Midland English friend; pal: used chiefly as a term of address
[perhaps from dialect wack or whack to share out, hence one who shares, a friend]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
2. very bad: All drugs are bad, but crack is wack.
[1935–40; perhaps back formation from wacky]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
n (Brit inf: as address) → Kumpel m (inf)
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007