the.com/whack
A sound, a hit, a murder, and a put-down — all in one tidy syllable.
means To strike something hard, or as slang, to kill, or as an adjective, to be crazy or low-quality.
from An 18th-century word born purely from imitation — it simply sounds like the blow it names, the verbal cousin of thwack and smack.
Mob speakTo whack someone means a contracted killing.
Out of whackMeans broken or misaligned, origin genuinely murky.
Hip-hop adjectiveWhack means terrible, wack drops the H.