The state of mind after a night of drinking, being severely hungover, not understanding the world, asking yourself the question "what is life?". Can also happen after doing drugs. Can lead to severe facebook stalking/commenting, and writing embarrassing things on the internet. Stooper is much like being in a cloud. It is a state of mind.
I am in such stooper right now after doing all of those keg stands last night, I can't even remember my dog's name.