The Collaborative International Dictionary
Whack off \Whack" off\, v. t. to sever with a blow; to cut off.
Whack off \Whack" off\, v. i. to masturbate. [Vulgar]
Wiktionary
vb. (context intransitive slang English) To masturbate.
Usage examples of "whack off".
When I used to get it now and then, not knowing when, but figurin' I would, I didn't whack off near as much.
Some of the guys at the station, they think it's odd if you whack off.
Maybe if they're poking someone every night they don't, but when they're not, they whack off.
May I suggest this: We'll whack off a leg and barbecue same as an earnest of good faith and token of guaranteed non-contaminaciousness.
Forget about killing Luc, she was going to whack off his favorite body part.
Judy thought of something she'd like to whack off with a pair of scissors, but he most likely wouldn't appreciate hearing it.
And now, she thought, you can all go back to the Hyatt and whack off.
Flynn sidestepped a jerky rush, letting Neely whack off the thing's head.
And you know I think blood is really icky, but, golly, we might have to whack off a few bits to close the deal.
Dinky says they get that name the first time they successfully whack off, but that’.
Dinky says they get that name the first time they successfully whack off, but that's just Dinky being Dinky.