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Sway them from side to side. You should be able to complete a full sway that goes from left to right within one count of the four-count beat. Your arms should also cross in front of each other as you wobble your hips. Keep your arms crossing to the beat, as well. Your shoulders and hips will take turns swaying from front to back, causing your torso to wobble from front to back. When the hips are toward the front, your shoulders should be toward the back, and vice versa. Think of a waving flag. Try to mimic the way the flag waves, wiggles, and wobbles in the breeze using your torso. The easiest way to occupy your hands while you twist is to do a hand roll, in which your two hands circle each other front and back at the front side of your body, roughly at chest level. Do this hand roll to the beat. The hand roll is not the only move you could use, though. You could also point side to side, wave your arms, or do whatever else feels natural with your own personal groove. This part of the wobble is usually just improvised.

Summary:
Wobble your hips. Wobble your torso. Use your hands.