OOA 

Out Of Action

My car has broken down so is currently OOA.

OOA by Reshep June 21, 2017

OOA 

On our ass

Yo my mom knows me smoke she’s about to be OOA

OOA by I’m in class September 27, 2021

ooahhing 

the act performed by students when they think a teacher is physically attractive ;)

"The students in my class were ooahhing today."

ooahhing by pseudonym#101 July 18, 2021

ainz ooal gown

The overlord with a 10,000 year plan.

As expected of Ainz Ooal Gown

ainz ooal gown by A lonely weeb September 6, 2020

ooak 

Acronym for One Of A Kind.
It doesn't get more simple than that =)

Her style is so ooak!!!

ooak by soxscenexcore December 9, 2008

o_oa 

The standard "o_o" face coupled with an 'a' to indicate scratching of the head. The scratching of the head is also to indicate that the user is thinking, and also is used sometimes to indicate wonder or confusion.

Marine: Hey, what'd you do today?
Person: Hmm.. o_oa

o_oa by Marine December 5, 2003

OOAK 

One of a kind

She creates OOAK fantasy and sci-fi dolls.

OOAK by Max November 19, 2003