It could be 'both canon and fanon' if something was initially fanon and then later canon explicitly went there, maybe?

that's true...

See, I would consider that "fanon that was confirmed by canon" or something like that. I don't think something can co-exist simultaneously in both canon and fanon. Once it's canon, it's no longer fanon.

Which is pretty much how I'd see it too. But that was the only handwavy thing I could do to make it make any kind of sense.

Meanwhile - where is your tagline from? I find myself wanting it to be from that cracktastic La Femme Nikita fic, and almost remembering it as such, but I'm probably making this up.

Where else? It's the "Today Antiques Roadshow, tomorrow Armageddon!" fic.

I would say "Nuh uh! You're making that up!" but I remember the go-carts so I can't.

So that really was LFN fic?

Wow.

I don't think something can co-exist simultaneously in both canon and fanon. Once it's canon, it's no longer fanon.

If we were talking about reasonable people, I would posit that there might be a middle-category of "canon states A explicitly, and implies B, and C is fanon", where B is mixed canon-fanon and C, being logically derived from A and B, an even murkier mixed state.

E.g., the Angel episode Dear Boy implies strongly in a visual manner that Angel raped Drusilla, but never states it as such in outright words (or conclusive images). So speaking about that rape should be a mixed canon-fanon discussion.

But, where fanon is concerned, I don't think very many people are reasonable. (*cough* strawberry-scented hair *cough*)

SPN: there's a writer putting up "Drunken Sam" pieces. She posits that instead of drunk dialing, Sam Winchester gets sloshed and writes hate mail to Stephen King. [link]

My mind went to a number of hilariously scary due South places with that.

Mine too!

Another supernatural: someday (never comes) is a fantastic gen story about the life of John Winchester. Oh, it's just beautiful and heartbreaking.