what is jumping jack
jumping jack. n. 1. a firework having a long narrow tube filled with gunpowder, folded like an accordion so that when lit it burns with small explosions causing it to jump along the ground. 2. a toy figure of a man with jointed limbs that can be moved by pulling attached strings.umping jack. n. 1. a firework having a long narrow tube filled with gunpowder, folded like an accordion so that when lit it burns with small explosions causing it to jump along the ground. 2. a toy figure of a man with jointed limbs that can be moved by pulling attached strings.