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1.
AOS
short for "ahead of schedule"
"we made a pit stop to grab some munchies and gas, and STILL we made it there AOS!"
by Bonzai April 03, 2007
 
2.
AoS
Arc of Suck

A term used to refer to bad storylines in TV shows.

It is most often used in Smallville forums to refer to the Season 8 arc when Lana Lang returned to Smallville for a few episodes, during which time Lois was absent.
After Lana came and went during the AoS, Clois really lost its mojo.
by canon_iconic_suckit March 11, 2010
 
3.
AOS
AOS is short for Academy of Science, aka "Academy of Swag". It's a Loudoun County Public School. The members attend their home high school, like Stone Bridge, Broad Run, Briar Woods... on one day and AOS on the other. It's the best of both worlds!
Woah, you go to AOS? You got swaaag.
by nerdygirl:) October 25, 2011
 
4.
AOS
Army of Skanks-
used commonly to refer to a group of bithcy slutty girls at the Potomac School. class of 2011
person1: "did you see the AOS at Bobby's bat-mitzah last night?"

peron2: "yea. they are such skank-whores grinding with all of the guys there."
by an innocent victim June 16, 2007
 
5.
Commonly used acronym meaning adult over shoulder. Used to express question if the conversation is private or not.
Hey man, this is awesome.. a.o.s.?

nah

aight..found some...
by jdub8197 February 11, 2010
 
6.
aos
ace of spades- in other words greatest card in the deck
Two people play BS. One draws an aos, and the other yells "BS!" The guy says, "Take it," and the other yells, "Damn! it's an aos!"
by iaintaplayahata20 April 28, 2009
 
7.
AOS
All Options Suck - None of the possible choices or outcomes are desirable.
We can spend Christmas at your parents or at my parents? That's an AOS scenario if I ever saw one.

Freqently the choices open to us in life are AOS. The only thing you can do is pick the least sucky one.
by Stephen McVay January 13, 2004