Noun

wack

1. A person who either is "whacked" (i.e. mentally disturbed), or is a "whackoff" ( ignorant and irresponsible)

Synonyms

• wackjob

Adjective

wack

1. In hip-hop slang, inauthentic or "lame" ("Every record they ever made was straight-up wack.")
2. "out of whack" is a phrase referring to things which are out of their proper order-- i.e.: "Something knocked the (insert noun) out of whack".