There's not much you can do. You can mention it to him that when you guys go out, he behaves like a vomit donkey after a couple. That he gets sloppy, rude, and that it's no fun to hang with someone who can't hold his booze. Chances are good he'll either get angry and defensive or he'll promise you it will never happen again, or until Friday night, which ever comes first. Maybe he'll be responsive, and try to curb his drinking, or at least, eat a slice of pizza. Miracles can happen.
You could also match him shot for shot, and the two of you could live happily ever after as hobo and hobo.
There is just not much you can do to change his behavior, outside explaining how uncool it is. Don't paint yourself into the "nag" corner. You only have control over your actions, not his, and you want a relationship, not a rescue shelter. If he persists, and is unrepentant or repentant but unwilling or unable to back his talk with the walk, then dump his ass.
This way, he can find a similarly obnoxious souse, and you can find someone can drink like a man, not a lightweight.