An emoticon for Boo, the ghost character from the Super Mario video games.
*Luigi signed on at 12:11 AM*
Luigi: Mario, I'm-a so glad I finally got rid of all the Boos in-a my mansion.
Mario: You missed one... 3:D
Luigi: I'm-a talking to... a Boo?! O_O
Mario: lol jk-a!
Mario: But how can you be sure?... 3:D
Mario: lol-a jk!
Luigi: Mario! >:( So you were just-a trying to scare me cause-a you're jealous that I got the mansion and not-a you? Well I finally got-a something for myself, you should-a be proud of me!
Mario: idk you tell me... 3:D MWAHAHAHAHAHA!!