look up any word, like blumpkin:
 
1.
It is, indeed, yet another euphemism for masturbation.

As the description suggests, it generally refers to male masturbation.
I spent half the day, at work, in a cubicle in the toilets; fantasizing about rough sex with my boss, while having one off the wrist. Eventually I had to move to another cubicle when the toilet roll ran out.
by Jimi p August 10, 2006
 
2.
a term for wanking
i was sitting in my bedroom watching countdown and decided to have one off the wrist over carol vorderman.
by bake bean head December 05, 2003
 
3.
To wank using the hand.
He gave himself one off the wrist.
by Edna Sweetlove September 27, 2006