You can experience that feeling of being on the planet and falling off the planet at the same time. It's kind of like a "being here" and "not being here" thing.
It's sort of like that looking down at yourself and observing yourself as someone or something else. It's a way of "getting out of yourself." I don't think this is something you can just will. Or do on a dare.
But there are times this happens. It's weird and strangely ZEN. Usually we cling to life. We hold on tight. But there are times when your grip loosens. You slip out. You slip out of the bonds.
So you transcend, or ascend, or descend, or maybe you just reside in another space-time continuum. It's a feeling of dislocation. Maybe it's an illusion, but it's sort of agreeable.
You realize you don't have to hold on so tightly. Letting go is okay.