o// 

It is a head with one arm. The two slashes show the movement of the arm. So it's a way of waving someone as goodbye.

It has been around for more than 10 years but isn't used very frequently.
Often the shorter version o/ is used instead.

Frank: I g2g to bed now.
Lee: Okay, sleep well. Bye o//
Frank: o//

o// by l00n3y February 18, 2017

\o/ 

A smiley of a cheering guy throwing his hands in the air, expressing great happiness. In a rare case, it can portray someone throwing his hands in the air in exasperation or panic.

1. YES! My new computer has arrived! \o/

2. Dammit, I have loads of work to do and tomorrow's the deadline! \o/

\o/ by Fluid August 26, 2003

O 

The letter fucking o. Are you that bored?
Or you just smashed your keyboard but only a o cane out?

Pee pee POO POO

O by 🙇‍♀️🙇‍♀️🙇‍♀️ October 15, 2019

O 

Something someone says when they're too lazy to type "Oh".

Person 1: Sorry man I can't go to your birthday.
Person 2: O

O by DylanPaterson July 7, 2019

:o 

The act / face of being surprised.

OMG I didn't know he did that! :O

:o by Jak Dude May 5, 2005

o .

a way to make any conversation awkward

o .

o . by o . man September 15, 2010

;o 

Smillie for joking or messing around

- ure mums teh hawt
- i know ;o

;o by hvg666666gh March 30, 2005