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1.
to jack off until one cums.
I had to wack off after i watched baywatch.
by Brandi February 06, 2003
 
2.
Same as Jack Off and Jerk Off.
"I am gonna wack off with coconut shampoo... then it will smell like coconut."
by Aeon_King April 11, 2006
 
3.
to masturbate (male)

a phrase that didn't exist until someone mixed the phrases "jack off" and "wank off"

not to be confused with "wacking"
I saw my brother wack off to porn when I snuck in his room.
by selenagomez123 September 07, 2013