:P

When your playing some multiplayer game and you feel derpy so you type :P in the chat so other people feel ya.

Guy One: OMG I LOVE THIS GAME ITS MY FAVRET!!
Guy Two: Dude you spelled "favorite" wrong bro :P

:O

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