Taka Aono tried it the day before round #3 in Houston and landed on the passenger side.
what is it?

 

well 3d is up/down and left/right but also front/back. So I would assume it would be something where you try to do a controlled flip of the car, probably tail over nose so that you would then end up pointing in the other direction. You'd have to catch the edge of the tires just right though.