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While your partner is riding in reverse cowgirl position, the partner being ridden surreptitiously sneaks their thumb into the riding partners butt. When they turn around in surprise, the partner being ridden puts his hands up and says "Guilty!"
Susan, "Did you just stick your thumb in my ass?!!!"
Josh, "Guilty!"

Later...Josh to his friends," I actually did it, I gave Susan the Guilty Bronco!"
by GuiltyBronco June 22, 2012
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