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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.
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]
v. Vulgar Slang
To masturbate. Used of males.
See beat off