I think you're referring to a Miller Flip (or at least, the one Jed's referring to). Google/Youtube it as I'm too lazy to search for it.
Best way to start learning this trick is to take it off of small hips/tables with a sloped side. Aim for the skier's left of the lip of the jump and come in on your heel edge. As you pop, you want to drop your front shoulder and try to spin 360. As you come around to to that first 180, drop your leading arm (if you're regular, this will be your left arm) and quickly plant your hand.
The plant helps stop the cork and your body will naturally come back around. It helps to grab indy.
I'm not good at explaining tricks on the interwebs. I'm more of a kinesthetic/visual learner but hopefully this helped. Maybe Jed can shed some light too.