dominant hand 

The hand you write with.

My dominant hand is my left hand.

dominant hand by threallegend December 19, 2017

dominant hand 

A guy's dominant hand is the hand most dudes usually use to jack off with.

I usually use my dominant hand to jack off with, unless I want to have a non-dominant hand jack-off session.

dominant hand by USAF Cadet June 23, 2021

Jerking off with the non-dominant hand 

V. To engage in the sexual act of "jerking off" with the hand that was not intended, by God, for that purpose.

Linked in case studies to the acquisition of carpal tunnel by exposing your "wanker" to odd angles of hand movement.

See also: Awkward masturbation techniques.
See also: The ouewwwwww face.

Andrew, upon getting home from school Wednesday, attempted to shag his dog with his left hand, which he had never used before. Having missed out on years of practiced stroking, the left hand was inconsistent, uncooperative, and altogether an awkward and unfortunate choice. Andrew has decided that there will be no more jerking off with the non-dominant hand ever again.

Jerking off with the non-dominant hand by Gee Twat December 30, 2009