Top Definition
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.
por Rayenna 25 de Setembro de 2003
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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.
por Lexy C. 13 de Novembro de 2007
The astronomical unit (AU or au or a.u. or rarely ua) is a unit of distance, approximately equal to the mean distance between Earth and Sun. The currently accepted value of the AU is 149,597,870,691 ± 30 metres (about 150 million kilometres or 93 million miles).
That star is x AU's away from Earth.
por Maverician 24 de Março de 2005
'Au' is also a Finnish word and it means the same as 'ouch' in English.
A: Viilsin vahingossa sormeni auki. (I accidentally slit my finger open.)
B: Au. (Ouch.)
por sirggu 28 de Junho de 2006
a sound made by those of island decent
au bro.
au i smasha your face
por Gamgetta 19 de Dezembro de 2004
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