"Here We Come A-Wassailing" rules as a christmas carol because wassailing is just a really festive way to say "getting shitfaced drunk in public" and isn't that what the holidays are all about?
i love it because it's basically making your boss/landlord get you and all your friends drunk, historically
i am going to be honest all i actually know of Here We Come A-Wassailing is the MST3K sketch version where the bots try to scam Mike out of his debit information. love and joy come to you, unless you cannot provide the wassail, then severe financial penalties will co-o-ome to you