A defensive maneuver in which the victim quickly kicks both shins of a larger attacker to escape. Once the attacker has been surprised, you will have about 5 seconds to run for the hills. Only used in self-defense, it shows a sign of weakness if you surprise someone smaller than the surpriser or someone that didn't start the fight.
Jim: Hey Josh, you know Bob, the guy that out-weighs me by 50 lbs?
Jim: He was picking on me so i gave him a Sicilian surprise.