1) When there is a big ruckus.
2) When something isn't going as planned.
-- Surfers use it alot --
Theres a group of surfers out waiting for a swell then the perfect wave comes and a bunch of people go for it and end up snakin' the ride while bumping into each other, then my friend you would use the word turbulence (with the hang ten hand movement).
An air pocket, also known as a quiff caused by a rapid force relocating your body through a jump in the airpressure of a plane, making lots of air escape.