This is the foundation of all robot dances. A good spin is not just about the motion, it's about the attitude.
Start with your feet shoulder-width apart, with your arms relaxed by your sides.
Now, imagine a giant tornado is sucking you in from the side, and you have to spin to avoid it.
Twirl around like a dervish, your arms outstretched and your torso loose.
As you spin, keep your upper body still, and let your lower body rotate around your axis.
Practice in front of a mirror, so you can see yourself spinning like you mean it.