W-T-H Is Going On At Pink's Concert?

Here Pink is singing and doing a private concert of sorts and that's all gravy, BUT WTH is going on with the girl next to her and the toothbrush? Are they demonstrating fellatio techniques? How to vomit properly? How NOT to brush ones teeth?

You know Pink is liking this!!! Oh and yes, yes I get the reason behind the picture now, it just took me a minute. I'm not quick this morning. ~grin~