1
general::
Phrase(s): whack something off
1. Sl. to complete something easily or quickly. • If you want a pair of these, I can whack them off for you in a few minutes. • The artisan whacked off a set of the earrings in a few minutes. 2. Sl. to cut or chop something off. • A tree branch is rubbing against the house. I guess I’ll go out and whack that branch off. • Whack off that other branch while you are at it.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
1. 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] 2. Masturbate, as in He went to his room and whacked off. [Vulgar slang; mid-1900s]
American Heritage Idioms