When your surprised in a multiplayer game or you want to act funny so you type it in the chat.
Guy One- WOAH THAT OmgyaboiplayzYT123 GUY JUST MOVED TO THE TOP OF THE LEADER BOARD WITH A 79 KILL STREAK
Guy Two- :O
a face to show suprise or just to spam on roblox to get attacked.
{person 1} ":O"
{person 2} "what"
{person 1} "i think you farted"
An screaming yelling face of anger or excitement
John: What are you doing?
Person 1: Shut the fuck up! :O
John: *covers ears* Dang, that's loud but I can't scream.
etc
An orgasm you get while standing
She deserves a standing O for that back massage she gave me earlier.