verb (used with object)
verb (used without object)
- to cut off or separate with a blow: The cook whacked off the fish's head.
- Slang: Vulgar.to masturbate.
Origin of whack
Synonyms for whack
Word Origin for whack
"to strike sharply," 1719, probably of imitative origin. The noun is from 1737. The word in out of whack (1885) is perhaps the slang meaning "share, just portion" (1785), which may be from the notion of the blow that divides, or the rap of the auctioneer's hammer.
Cut off, as in The cook whacked off the fish's head with one blow, or The barber whacked off more hair than I wanted him to. [Slang; first half of 1900s]
Masturbate, as in He went to his room and whacked off. [Vulgar slang; mid-1900s]
In addition to the idioms beginning with whack
- whacked out
- whack off
- have a crack (whack) at
- out of kilter (whack)