AO = All Out. Its the hip new slang way of saying All Out. It was made popular when Ethan of HG added it to his vocabulary. And now all the cool kids at school are saying it.
"Dude, that move was f*cking AO!!! You shot them all in their faces."
by The Most Hated January 20, 2005
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Stands for Anal Only. Can refer to a lifestyle without vaginal penetration.
Dude my wife switched to AO
That's sweet!
by Minx137 November 4, 2017
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A reference to the Bum-Bum, Anus, Ass, Brown-Eye, etc.
Stick that shit up in the AO!
by Gringey Jam March 5, 2005
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After Obama
I've been sick for 2 days; is California slowly poisoning our food so we don't have to witness life AO?
In the year 2018 AO, many middle aged people avoided receiving preventative medical care and diagnostic testing due to the incredibly high costs of insurance premiums.
by Poliskia January 18, 2017
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A person who is extremely hostile, and prone to attacks by religious fundamentalists and football players.

AO's are usually bald and lonely, and prone to fits of rage (See: Maldy Agre).
"Why hello AO, have you seen the new religion topic?"

by Polaris December 10, 2003
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a person whose favorite activities include going to the gym, playing tennis, binging/purging, and cruising men's restrooms at UCLA
the guy in the sleeveless pink muscle tee blew AO through the glory hole
by lb627 November 15, 2006
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Alliance Ownz. The Alliance is better than The Horde.
Alliance Ownz = AO AO AO!
by Ninjarokku March 14, 2008
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