Strange Usage of エフエー (FA)?


I was watching an anime, and there was a scene in which the protagonists,
after sneaking into a morgue, find their own dead bodies and confirm that they
are, in fact, dead (there's lots of occult-y stuff going on, don't worry about
it). Anyway, during the reveal, the main character says:

[code]

    「まじで？僕ら死んじゃったでエフエーなの？」
    
[/code]

I looked up what エフエー meant since it was clearly meant to be FA, which should
be an abbreviation for something, but none of the words it stood for seemed to
make sense for the context. I found things like Free Agent, Factory
Automization, etc., but none of those make sense in this context. I guess the
least weird one would be Free Agent, but unless there's some meaning to that
phrase that Japanese has come up with separate from the English definition, it
doesn't make sense. The translation that was given was, "Seriously? So we all
died and that's it?" I don't have any problems with the grammar, it all flows
normally, but I can't tell what FA is--we all died and what, exactly?




> The translation that was given was, "Seriously? So we all died and that's
> it?"

How about the エフエー is **_final answer_**?




ファイナルアンサー is a popular phrase which was said by a quizmaster in his popular TV
game show. He said it when he confirmed with a panelist whether your answer
was final. There are some meanings of an abbreviation FA and this エフエー(FA)
would be an abbreviation of ファイナルアンサー(Final Answer) to judge the meaning by
the context.

This is the TV show: <https://www.youtube.com/watch?v=d2MqV4VioMo>

