KooLAusGuy: Aus is so cool!
Hotgirl645: Yes it is!
by helloguy3953 January 17, 2019
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Used to represent excitement or sensations not easily expressable with words. Often used at the beginning of a phrase/insult or as a greeting as well.
Au au! You are quite the ass.
Au au! I do quite know what's in the science topic test... Suckers!
by Eugene Wong September 14, 2003
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AU simply means alternate universe in fan fiction forums. You take a famous person and make them unfamous, make them "normal."
In this story, Elvis never sang and he became a chef.
by Rayenna September 26, 2003
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1. A short used for "Alternate Universe" in fan fictions.

2. The measurement of distance between the earth and the sun, usually used in measurements, an abbreviation for "Astronomical Unit".

3. The abbreviation for the element "Gold" on the periodic table.

4. An short way to say "Australia"
1) In this Undertale AU, sans and papyrus swap places.

2) The distance between the earth and pluto is approximately 34 AU.

3) AU is very expensive and rare, a very weak but corrosion resistant element.

4) For my last vacation, I went to AU.
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A fanfiction term meaning Alternate Universe.

An AU fic is a fanfic which includes elements of a book which are completely unfeasible.
That Harry Potter fic where his parents were still alive was totally an AU.
by Lexy C. November 13, 2007
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A alternate universe, based off the game, but basically changed in some way.
Do you know what a AU is? A alternate universe, based off the game, but basically changed in some way.
by TeamPaydayTypicalColors2 January 11, 2017
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a Chinese internet fans group of the vitual youtuber group A-SOUL. AU is a homophone same to "A友", meaning literally "the friend who is an A-SOUL fan". Unlike the insulting name "A/" meaning literally "the stack who watches A-SOUL", it is a more friendly name to call them.
"Why does AU appear in this place?"
by JIAXINTANG[Infwww] July 5, 2022
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