Short for "Age of Shadows" - the version of the popular online MMORPG Ultima Online that moved focus more onto what items the player has in his inventory than his actual skill.
by Ultima May 26, 2004

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.
by The Most Hated January 20, 2005

by Gringey Jam March 5, 2005

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.
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

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).
AO's are usually bald and lonely, and prone to fits of rage (See: Maldy Agre).
by Polaris December 10, 2003

All Over. When someone is clingy towards another person, esp. when the other person isn't interested.
by ghost July 31, 2003

a person whose favorite activities include going to the gym, playing tennis, binging/purging, and cruising men's restrooms at UCLA
by lb627 November 10, 2008
