Please forgive me…I’m over 30 and was never a clubber.

In a number of songs, women “get low”. In “Low”:

Shawty got low low low low low low low low

In “Belly Dancer”, they drop down and touch the ground;

Hey, ladies drop it down, just want to see you touch the ground

…

You ain’t even gotta drop down if you want to

What activity is being described here? What are these women doing?