Skanking is a dance style that originated in Jamaica and is often associated with ska and reggae music. It involves moving your legs and sometimes arms in a bouncy, hopping motion while keeping your upper body relatively still.
To do the basic skank, you start by standing with your feet shoulder-width apart and bending your knees slightly. Then, you alternate lifting and stepping your feet, moving one foot forward as the other goes back, and back as the other goes forward. You do this in time with the music, so it becomes a sort of bouncing or hopping motion.
Sometimes you might add in some arm movements or turn in a circle while skanking, but the basic idea is always the same: bouncy foot movements with a steady rhythm. It's a fun dance style that's great for getting up and moving to upbeat music!