Awww no one nominated me this year? I at least got that far last time. Will have to piston moar and harder next year Anyway, this one is almost always between Ryu and Tres for me, and I gotta vote Tres this time around. I do be hoping for first and second for those two.
A piston is "a solid disk or cylinder that fits inside a hollow cylinder, and moves under pressure (as in an engine) or displaces fluid (as in a pump)". So a pistoning pen0r is a pen0r that moves like a piston