OA 

short for “objection: argumentative” \ generally used to avoid or nullify a negative question or remark

Whenever his ex asks him a question, he infuriates her by answering with OA.

OA by ΔиłĦ☼иצ ߀₡ʞ June 23, 2011

OA 

The Filipino abbreviation for Over Acting. This term is usually used to describe a person who is basically a drama queen. Also implies immaturity.

She threw a fit in the store because they didn't have her size. She is so OA.

OA by lilmille September 14, 2005

oa 

something you say when you're too lazy to say "Ok".

Brandon: You are a stupid asian.
Ping: oa.

oa by mtlf October 16, 2019

oa 

Oa is a dumb ass that has small pp

Oa is PEPEEEEEE

oa by Melanie Dunn April 2, 2020

OA 

The order of the arrow, An Honor society in the Boy Scouts of America.

Hey, are you in the OA?

OA by He'sTheMan March 16, 2005

OA 

an acronym for "over acheiver". Used by high school students to describe someone who has a perfect grade in a class or does more work than necessary.

Person 1: I wrote two extra pages for my book report.
Person 2: You're such an OA.

OA by windbeneathmywings4ever September 21, 2005

OA 

Office of Administration. Usually used in colleges when it's almost time for final exams and the hall director gets too lazy to full spell it out for you. Or maybe it's not. Who knows.

Ask the OA for help.

OA by a;skfjawoifja;asi April 20, 2018