Wack Definition
 wăk 
  wackest, wacker
  
    noun
  
 A person regarded as eccentric.
 American Heritage 
    adjective
  
 
    wacker, wackest
  
Very bad.
 Walked out of a really wack movie.
 American Heritage 
Wiktionary 
(From hip-hop slang) Bad (as in not good), inauthentic, of an inferior quality, contemptible, lacking integrity, inauthentic, lame, or strange.
Every record they ever made was straight-up wack.
 Wiktionary 
Other Word Forms of Wack
Noun
Singular:
 wackPlural:
 wacksAdjective
Base Form:
 wack
          Comparative:
        
 wackerSuperlative:
 wackestOrigin of Wack
Back-formation from wacky
From American Heritage Dictionary of the English Language, 5th Edition
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Back-formation from wacky.
From Wiktionary
 
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