This is discussion archived from a time before the current discussion method was installed.
Ununnilium: Wow. This must be something that evolved in my post-fanfic days.
Shwoo: I've only ever seen this used sarcastically, not in fanfic summaries or anything.
So It Begins: Does this mean that TV Tropes is Informal!Pop-Culture!Wikipedia? ;)
Kizor: Pretty much. And ooh! I've had "!" on my "articles to start" list for ages but it hadn't gone anywhere because I could never figure out what to call the article. Good for you.
Cassy: A few 'important' people and fanfics in the FullMetalAlchemist fandom use it. One that comes up fairly often is "AU" for "Alternate Universe," as in "AU!Ed."