Ok, I think, a good description is impossible to give, but there are two elements that are in my mind important parts of a good orgasm: 1. you cannot think during it happens, you´re just feeling what happens down there, 2. The really great orgasms are less like sneezing, more like a very sweet pain that pushes the cum out. And immediately after the shots an incredible tickling and relax in the tip of the penis that makes it impossible to continue for a while.
Any disagree?

__________________
If every material thing is gone, my smile and my tears stay left.