A lap, table, or any dance conducted by an aged stripper.
"I went to the strip club and bought me a "Granny Dance".
When a female is in a club and they dance sexually but it does not suit them as a person. This results in other surrounding people feeling uncomfortable.
For example "God , i hate when she tries to grab me in the club, it fees like my grandmas trying to grind on me."
"i thought they were best friends , why is she trying to get away from her?" "oh, that's just granny dancing syndrome"