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1.
When a person is lying on the ground, and you grab his legs with your hands and press your foot into his testicles like a gas pedal while pulling on his feet. Sometimes this can be combined with the yelling of "GAS PEDAL!"
"Oh man! He just got gas pedalled good! He's not going to have kids for a while!"
"Hey look! His nuts are a gas pedal!"
by Nebetsu November 26, 2004
 
2.
When you put your mouth to someone's butthole, step on their foot causing them to fart, and then inhaling the gas.
She was a freak man! She let me gas pedal her.
by wetzpretz December 02, 2013