I've thought of it a couple different ways. If it's more of a roller/jump I just jump a little early, and as I fly over the top I think about pulling my heels up towards my butt. That seems to press the tips of your skis in nicely for a little extra pop.
If it's more of a abrupt transition/ take off I basically do a 180 and then set it like a switch spin.
The second way doesn't always look as smooth but Benchetler had a butter 9 off a cliff in his edit from 2011 doing this way and it still looked super sick. Either way I think it really helps to keep my ankles super flexed to help reduce any wiggle room in your boot (or just crank your boots super tight).