I was curious about thistoo when I found one for sale on http://cl.radiux.com/mn/minneapolis/forsale/forsale_farmgarden/view_153_58.htm
It's some guy selling his on Craigslist.
It's kinda funny looking: http://minneapolis.craigslist.org/zip/677773013.html
THE REAL ANSWER:
A Gubbled Skurper is a series of three large metal rings like mountain bike rims threaded onto a rod. The rims should be set equidistant from one another. That assembly is then placed on a metal frame with two 18" - 24" support arms on which the ends of the rod are placed. Once rod and wheel assembly is mounted, a beer keg is then set inside two of the three bike rims. The aux. power comes from two electric motors set beneath the support frame. The main power comes from posting this goofy looking contraption on Craigslist and listing it as a collectible to get us all talking. I love it! Way to go Skurper poster!