Forward Snake / Double Spin / Shotgun
Yes, this movement has many names. Snake from clubspinning, shotgun from the old-school and double-spin from the 'obvious' school of naming. To get extra beats (read circles) out of the staff without passing it from hand to hand / doing contact or fingerspinning, you twist your wrist and arm up on both sides of your body to get an extra half circle on either side, giving a extra beat to the entire movement.
See the Reverse Snake for an animated gif.
http://tutorials.firestaff.net/tutorials/tutorial-videos/wmv/spinning/forward-snake.wmv (Right click, save target as... )
Streaming Flash Video: