O! 

An unexpected orgasm.

Sheila had an O! when she awoke to Kevin sucking her nipple.

"I just had an O! when I changed my thong!" Lisa said.

O! by ThatGirlinRed April 6, 2007

O! 

An attempt by the Omaha, Nebraska city betterment committee to create a slogan for the city. Unfortunately in their attempts, they didn't realize the sexual connotations that are now associated with it.

slogan-"Buy the Big 'O!'" Originally coined to keep commerce in Omaha businesses. Now means to go downtown and get a prostitute, or in some other way purchase a means of orgasm.

O! by Calvin Hobbes September 19, 2006

O! 

This is the replacement for the word LOL which is a very overused word on the internet O! is a more useful word cause that is what you are rely doing when you say LOL

O! that was a funny joke

O! by MIKEY June 29, 2006

o! 

Another way to call someone (like your friend) when you dont remember or know his name

o! come over here!

o! by ChessEnjoyer April 29, 2023

\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