It was used to describe the turbulent period of a Google index/algorithm update. This used to happen once every few months, sometimes lasting for days. Fluctuating results were the main symptoms. Nowadays, there's no such thing anymore. They update all day every day continuously.
Or "tapping of the feet", like the guy in the corner who's too scared to pull any moves on the disco floor.
Here's the definition of google dance from wikipedia. Google dance refers to the period of time when Google indexes are tuned. This will often cause both a fluctuation in index size as well a significant change in a web site's search result position.
Depends which Google dance you talking about.... Google dance is an annual party that Google holds for its employees to shake it up.
LOL,that was really funny but in reality it is not so funny my site which ranked 4th got to the 10thpage due to this so called google dance Thank God that was not a year long dance party so i got it back in few days