Definitions by SGT JPB

Knuckledump 

The term used to describe masturbating in a porta-shitter while in the field.

PVT 1: "Dude, we need to go back to the rear so I can get laid!"

PVT 2: "Why don't you just go to the shitter and take a knuckledump?

Knuckledump by SGT JPB January 5, 2011