Flossing
The "floss dance" is moving your hips side to side while swinging your arms in beat with the motion...like you're flossing the air around your hips.
Unfortunately, rhythm isn't for everyone, and flossing became one of the most poorly done trends, followed by the "griddy." Like all trends, it was overdone, but as long as the kiddos are having fun and not dislocating their hips, all is well.