Suddenly the trucker jammed on his brakes, and the two vehicles collided. In 1999, over 2,400 Berkeley meters were jammed, smashed, or sawed apart. The first attempt failed when the rollers jammed up. Cars jammed the routes out of town. He and Grappelli frequently jammed together, accompanied by a loose circle of other musicians. We've jammed six riffs into one song? We just jammed and played some blues on the side. The impact jammed Austin's neck and left him temporarily paralyzed. Walters' tear gas gun then jammed. We just jammed, which is what we still do today. From the grandstands to the infield, the track was jammed with fans. Conical scan radars can be easily jammed. Sherman was able to fire 8 rounds before his rifle jammed. At that time Lockett's gun jammed. The hit also jammed the ship's siren in the "on" position.