Of course there are many different levels of "drunk". Can't say I've ever played with anyone who was literally falling-down drunk, but there have certainly been many experiences with people of lesser levels of intoxication.
Here in the US, it isn't uncommon to have scramble events that include people that aren't regular golfers. Those events can get very sloppy. Once I played in one of these scrambles with this very friendly fellow who alternated between marijuana and beer for the entire 18 holes. The word we use here is contact buzz and I think I would have failed a piss test the next day.
It was fun, but I'm not entirely sure it was golf.
I know him. He plays in Germany now. He's a total moron.
I always tell him that I am playing a practise round and not keeping score today.
Of course at the next he'll ask again. When I tell him to mind his own business and stick his pencil up his ass, he'll not ask me for at least a couple of holes.