Top definition
The acronym for the website, "isanyoneup".
Hey Dude, I totally just saw your girlfriend on IAU!
by SummerXyay June 23, 2011
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Soft and offensive. Just like you.

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2
Inappropriate Apostrophe Usage.
When somebody uses a ' unnecessarily.
<Fred> What size PATA drives do you need?
<Bob> I need some 500gb's.
* Fred stabs bob for IAU
by grammar warrior June 14, 2008
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Soft and offensive. Just like you.

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