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1.
When one presses one's foot against another person's crotch really hard. Usually when the other person is on the floor, and the standing person holds both legs.

Source of the term unknown. A variant where both are lying down is known as the Japanese Gas Pedal]
"Ugh, John just gave me a chinese gas pedal and my weiner hurts now."
by Koby_Fish January 19, 2012