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1.
UAS
Ugly as Shit.

If you are this, I weep for you. Please accept my apologies. It is the lowest of the low. You are so ugly, that there is no chance of fornication in this or any lifetime. Again, I apologize.
"Yamugi is UAS! She makes me sick!"
by Sky Walker March 14, 2005
 
2.
UAS
Under Age Slut. This refers to the fact that younger girls are becoming incresingly slutty, wearing clothes designed for older girls. Sluts under the age of 16 are UAS's.
Look how short that year 8's skirt is, what a UAS..
by Laura1o1o1 March 22, 2011
 
3.
UAS
Uruguayan American School

An elite, small school in the city of Montevideo, Uruguay, full of rich Uruguayans, Brazilians and sons of diplomatics from every embassy. There is a lot of diversity, most people speak 3 languages or so.
You can probably sleep your way through high school and still get decent grades if you take all the easy classes, but if you decide to go for the APs be prepared to go to school everyday (including Saturdays and Sundays), and work like if every class was your only class.

Be prepared for SAAC (Southern American Athletic Conference) 90% of the people participate in at least one sport. Girls usually loose (anyways, they are hot!) but guys always win, specially in basketball.

When we graduate from high school, we usually go to prestigious colleges in the United States, but we will never forget UAS .
If you are not Uruguayan, UAS is the place to be.
by UASTOROS! April 21, 2009