it means that u have low regard
It means she was dancing low to the ground while shaking her butt.
It is more common to use the expression in regard to or regarding.
Low - Flo Rida featuring T-pain. [Chorus:] Shawty had them Apple Bottom Jeans [Jeans] Boots with the fur [With the fur] The whole club was lookin at her She hit the flo [She hit the flo] Next thing...
In meteorology low is the cold air low pressure system that often brings more bad weather do to the lower barometric pressure.