Universities Admission Index.
i.e. a number correct to two decimal places that will ultimately affect, if not the whole, the next ten or so years of your life.
UAI < 90 = DEATH
by Corsha August 3, 2008
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The hottest business university in Chile.
-How was the party last night?
-It was awesome!!!, those UAI guys really know how to party...

-Did you saw that hot smart blonde?
-yeah, she must be UAI.
by P@tron June 13, 2009
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An alternative for yay, meaning one is very happy.
"Uay i passed my test!"
by Leanne March 16, 2005
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