It stands for 'Are U Stupid Or Something'?
Dude 1: Have you watched Glee yesterday?
Dude 2: Glee? Wasn't it on Friday?
Dude 1: AUSOS?! It always airs on Tuesday!
Dude 2: Jeez.. I am.

LOL xD
by Darrenseyebrows April 29, 2012
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