Here's how you do it: Its only possible on console. 1st, is your gonna want to back up to a backflip ramp while barely pressing down on the left trigger, no gas through the moonwalk AT ALL. And this is gonna sound weird but you brake harder to go forward but you brake less to go backward. If you don't wanna do the backflip technique, there is a harder one. you have to put your front wheels on a short, but steep ramp. Then as soon as you hit the ramp with your back wheels, you have to immediately reverse, but just enough to get the stoppie and to not go on your roof. Plz like, this took me a while to makw