An abbreviation that is widely used in role play, fan fiction, texting and chat, and on Facebook and elsewhere on the internet, but what does AU mean in slang?
Most Common AU Meaning
AU stands for Alternative Universe.
AU is used to refer to a form of fan fiction, in which canonical facts of setting or characterization in the universe being explored or written about are deliberately changed.
Someday I should just write a 100k+ Harry Potter AU.
Other AU Meanings
What Does AU Mean?