Back-formation from wacky.
wack (plural wacks) An eccentric; an oddball; a weirdo.
Adjective wack (comparative wacker, superlative wackest) Egregious (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. (slang) crazy, mad, insane
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