Gas Pedal

When your friend/enemy is lying on their stomach and you grab their legs and press on their crotch with your foot from behind.

Mark: "I was wrestling with my big bro until I fell down and he grabbed my legs and squashed my crotch against the floor. Now its swelling."

David: "Sorry little bro. You know I love a good gas pedal."

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Nut Grinding

When someone is on the ground and you stomp on their balls. Then you start twisting your foot as your pressing down on them until the guy can't have any kids and the balls are swelling or flat as paper.

Only accepted by RoShamBo masters.

Tom: "Man my friend Jim was nut grinding today me after what I said. And they're STILL swelling!"

Jake: "Yeah your not kidding. You probably shouldn't wear your undies in the house anymore. And what did you say?"

Tom: "I said he has no balls and can't fight crap."