This geektastic costume is the creation of Craftster user, shdwstrm, who entered it in a costume contest at the Toronto FanExpo. You can read her initial post on Craftster for info on how she made it. The brief video above shows her bopping across the stage on all fours to the famous Nyan Cat music. I hope this kicks off a slew of Nyan Cat costumes for Halloween.
Related:
Nyan Cat Quilt
Download And Make a Papercraft Nyan Cat Machine