You've never seen anything like this, and when you do see this you are going to wonder why you have been hammocking wrong your entire life. Now you feel stupid, don't you?
If the video isn't evidence of how AWESOME this is to do, I'll explain. You need a hammock, preferably one that is easy to grip and is well placed in the ground. The second part isn't necessary if you don't mind the hammock launching you in a completely random direction.
Then you get a couple friends to start spinning. It's good to build up energy, and have you friends hold that energy to achieve the most extreme results.