Onb 

Outta nowhere boner.

It describes when a male erection happens randomly outta nowhere.

Alex: dude what’s that??
Costa: it’s an ONB, stands for outta nowhere boner. It’s normal.

Onb by Vboclaramente February 23, 2023

ONB 

(n.) Other Niggas Bitches

A Bitch whom is in a committed relationship with another Nigga yet not exclusively. Often referred to as any bitch in a relationship ever if you have pimp juice.

Tom doesn't like to buy bitches things or hear about their stupid problems so he only rolls with ONB's. Tom is a real Mac.

ONB by Association of Players & Pimps September 5, 2011

Onb 

We all know this means on Buddha 🤨🤨

“I just got 200 dollars” “ onb???”

Onb by Lukaiss89 June 1, 2022

Onb 

On boob

“You being fr” yea onb

Onb by Onb May 4, 2022

ONB 

Abb. for Orange is the New Black.

Because its shorter and easier.

Let's watch a ONB.

ONB by Checmix78 September 4, 2013

ONB 

Old news B. Used to express disappointment in someone that posts something in a group chat that has already been reported. The “b” is just a term used to refer to a friend. It does not stand for anything.

Person 1: wow. Pistons just got the first overall pick in the lottery!
…. moments later…..
Person 2: Pistons just won the lottery!
Person 1: ONB
Person 2: Damn, b. You got me.

ONB by DJRITM December 4, 2021

Onb 

- Onb is a commonly used slang term that means “On Brian” which refers to the legend, Brian Stenke.

- used to swear upon Brian Stenke’s name that something is factual and true

Onb I just went on a mission trip

Onb by Jawsh86 July 16, 2022