Oño 

Some teens that got bored, went on Discord made server. When they need a name, some kid said Oño. Thats how it was born

I am the Oño king!

Oño by Oneline October 5, 2021

ono 

Or Near Offer

I will sell this for 25 Quid ONO
(I will sell this for 25 Quid Or near Offer)

ono by Aditee January 21, 2004

OnO 

Another way of typing "oh no".

Commonly used by furries on online message boards.

Person 1: "Hey, why do you have a picture of a dog set as your profile picture? Are you a furry or something?"
Person 2: "OnO"

OnO by Starstrucksam January 30, 2019

ono 

Or nearest offer.

When you are selling an item and want to say you are flexible on the price.

Jay: I'm selling this for 25 euros ono.
Bob: I'll give you 5.
Jay: Done.

ono by typingduck September 6, 2010

ono 

oh no! but with more urgency and missing 2 characters

ono what happend!?!?

ono by Lukasucksatdefinitions April 28, 2020

ono 

in hawaii, descirbes food as "delicious"

"Ho, this chickin is ONO!"

ono by haoleboi March 3, 2005

ONO 

On ocassions relating to the sale of second hand product through an app, etc. It stands for "On No Ocasion" often to do with delivery.

ONO ask for postage.

ONO by Nguyen the knowledgeable. January 21, 2018