Online Role Playing Game, normally just an online RPG, no MM (mass multi player) element.
A good example would be Vitalise
games made with click team
products, non come to mind as I write this.
Used by people on IM programs to tell the other person to "shut up, my parents are watching".
Maddog: Hey Sarah are you up for some sex?
Sarah: Sure thing when do you want it?
Maddog: Sorry my mum walked in.