While you are walking down a road or any public place you whip out your dick and walk at an awkward pace while slowly whacking off. You will then have completed a nordic tug.
Originating on the Providence-Newport ferry, specifically the Bristol stop, the act of giving someone a hand job using the salty, frigid water of the Atlantic Ocean as lubricant
On the way home from the folk fest, Karah reached overboard, dipped her hand in the water, and gave me Nordic tug all the way back to providence.