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@Stormy: I tweeted asking for a definition of "meta," not "meta-fiction," as you're specifying here, but the recent term that gets tossed around a lot in scifi, i.e., "That's so meta." I think you're 100% accurate in your take. However, Ernie Cline's READY PLAYER ONE is called "meta" because it's loaded with 80s pop- and tech-culture references, but it isn't a book where the characters realize they are in a book, a-la John Scalzi's recent novel REDSHIRTS. So there might be a slanged-up meaning of the original term.
That being said, it was Potter's ubiquitous nature that partially led me to use Quidditch. It's not a few people watching the SyFy channel that know that story, it's damn near everyone.