..is short for ‘Adults Only’ (most extreme videogame rating in the U.S.). See also the other vg ratings: EC(Early Childhood), K-A(Kids to Adults; was replaced by 'E' in 1996), E(Everyone), E10+(Everyone ten years of age or older), T(Teen), M(Mature Audience), AO(Adults Only), and ESRB.
GTA:SA(Grand Theft Auto: San Andreas) is no longer rated 'M', but instead 'AO', and subsequesntly is no longer on the shelves, barely in stock at all.
by Victor Van Styn July 26, 2005
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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 12, 2010
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..is short for ‘Adults Only’ (most extreme videogame rating in the States). See also: EC, K-A, E, E10+, T, M, AO, and ESRB.
GTA:SA is no longer rated 'M', but instead 'AO', and subsequesntly is no longer on the shelves, barely in stock at all.
by Victor Van Styn July 26, 2005
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Armpit odour.
Also known as PO. Similar to BO but somebody with AO reeks very strongly of funky pits.
Piss you!!! That dude that just went past has a terrible case of AO!!! :-(
by Telephony July 26, 2020
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Short for Anal Only
by Minx137 August 10, 2017
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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
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Arresting Officer
"How was getting arrested this time?"
"Not too bad, had a nice AO for once."
by LazySmurf November 28, 2014
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