That is a funny phrase I saw on a reptile forum years ago. Everyone who read it knew exactly what he meant I have never forgotten it, and it is one of my favorite phrases now...
Basically it is the art of taking a stunned, prekilled, or thawed rodent, holding it in tongs or forceps, either by the hind quarters or by the tail, and wiggling, twitching, and moving it around, "making it dance", to elicit a feeding response and a strike out of the snake. If your trying to switch over a resistant snake that wants a live rodent, and your good at it, it can be quite an art form.