AO 

Stands for Anal Only. Can refer to a lifestyle without vaginal penetration.

Dude my wife switched to AO
That's sweet!

AO by Minx137 November 4, 2017

AO 

initials of philly playground soon-to-be legend Aaron Owens. Plays for AND1's Mixtape Tour.

"AO aint scared of nobody in no hood" and he'll bust all who come at him.

AO by LilBibby2342 September 6, 2005

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."

AO by The Most Hated January 20, 2005

AO 

A reference to the Bum-Bum, Anus, Ass, Brown-Eye, etc.

Stick that shit up in the AO!
A-OoOoOoOoOoOoO

AO by Gringey Jam March 5, 2005

AO 

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.

AO by Poliskia January 18, 2017

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"

AO by Polaris December 10, 2003

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.

ao by ghost July 31, 2003