He isn't drunken, he's suffering from Sciatica. The movement of his left leg shows that quite clearly, that's 100% not alcohol-induced. Look at his left leg, then at his right, then compare to the rest of his body. It can be seen easily, especially in this video, and as being a student of medicine I'm actually starting to get pissed about all these people thinking that kind of walk was based on an alcohol problem. You can't imagine the amount of discrimination people suffering of these kinds of nervous illnesses face every day. It's rooted in his Plexus lumbosacralis, not in his whole central nervous system, everyone who has at least some idea of how a body works can see that. That's a regional reaction, not a central one, which - guess what - hurts like hell in your back
But "nooooo, I have no idea about what I see there, but let's just claim hes being drunk and jerk myself off on that because it makes me feel good". There might have been cases where he was drunk, dunno, but he certainly wasn't sufferig alcohol-induced movement restrictions there. That's a regional nervous problem, not a central one.
No offense to you, but to the video-uploader.