"Get down, get down and move it all around" is a line from a very famous song by Backstreet Boys. Get down means come down, but it has several other meanings, too. If you get things down on paper it means you write them down. You can also get down to work at last, instead of scrolling Facebook ;)
Definition: e.g. start, come down, bring down, oppress, etc.
Example:Stop complaining! Get down to work now!