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It stands for User Is Blocked, basically what comes up at my school every time I try to go on facebook, or a teacher sees me playing games and presses some button on their computer.
Dude, you'll never guess what happened, those basters put a UIB on "Insert gaming website here".

by Cklizard July 10, 2008
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Aug 4 Word of the Day
Man's greatest invention, brain bleach removes bad memories and general DO NOT WANT moments. Every household should have a few gallons.
1: Dude, I just walked in on my parents.
2: Have some Brain Bleach!
by Andikun November 06, 2007
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