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8.
AO
A reference to the Bum-Bum, Anus, Ass, Brown-Eye, etc.
Stick that shit up in the AO!
A-OoOoOoOoOoOoO
by Gringey Jam March 05, 2005
 
9.
AO
Alliance Ownz. The Alliance is better than The Horde.
Alliance Ownz = AO AO AO!
by Ninjarokku March 13, 2008
 
10.
AO
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
 
11.
AO
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?"

"RAWR ARGH CLAW SCRATCH HOSTIEL /part"
by Polaris December 10, 2003
 
12.
ao
All Over. When someone is clingy towards another person, esp. when the other person isn't interested.
I saw Jimmy the other day down at Rock-ola and his ex was AO. She was pathetic.
by ghost July 31, 2003
 
13.
AO
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 14, 2006