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Sounds interesting, but it's very dangerous. Ever heard of zapping? You lean over and breathe heavily for about a minute, and then you let someone put you in a sleeper hold, or a big bear hug, and it knocks you out for a few seconds. You wake up with a funny feeling buzz, and everyone has a laugh if everything goes right. People die from that shit all the time though, and I've even heard of people going retarded from it.
A shotgun is where someone just puts the blunt in their mouth backwards and blows all the smoke into your lungs.
So this guy combined those 2 things, and probably got extremely fucked up.
sorry kinda old post but.. the other nite I was bored and a friend called me and told me to come to a party he was at. I got all excited cause it was a Friday night and I had no plans so far. Anyways I got there and my friend did exactly what you explained that can seriously hurt people and after he was done he was just standing there staring at his legs. He was like a zombie, all the kids were yelling and laughing and trying to get him back but nothing happened. Then he just got back to normal hit the ground and started laughing lol. He said he could see his legs spinning around his whole body and it was real trippy. I thought it was hilarious at the time but had no idea how serious it can be.