Here's a combination of definitions off urbandictionary.
After landing a sick skiing trick you ride away all steezy and relaxed.
and
After throwing down your tightest move on the hill, leaning back with your hand on the front of your pants and chilling as you ride away like its no big deal.
I'd say worst mimicked ski trend. People try to hard, but for those who it comes naturally to its the best ski trend. Makes for amazing eye candy. and makes for a lota mixed emotions like...WHAAAAA?!?!?!?
my afterbang comes with force. i have afterbang before anything happens. i even afterbang getting off the lift. i afterbang when i hop out of bed or get off the subway. im even afterbanging while i lie on the floor and type. i afterbang with shinbang.
it looks worse when you try to do it. just ride away from a steezy trick and dont try to do it. it will come naturally if the steeze gods think you are steezy enough.
I think of it as almost over-rotating on your trick after you land. Say you pull a cork 3 left side and land facing front again you rotate your body as if you were still trying to spin another 90. That's my way of afterbanging at least. Afterbanging is open to interpretation from everybody, adds to your own style.
Be careful when "afterbanging" a guy told me a story how this other guy he knew "afterbanged" so hard he shit his pants, broke both his legs, and started a avalanche that killed everyone in a hundred mile radius.