One appropriate use of this emoticon is when one computer user, playing an online, multiplayer game, is reading text from a conversation between two or more other users, and the other users are not aware that the aforementioned first user is doing so. If this conversation should turn to a publically embarrassing subject, then the first user would type in and send (f;..;)f, making it known that he/she has read all of the previous conversation and may intend to tell the public or the nearby online community about what has just been said in the conversation
User2: Hey have you ever thought about whether or not you're gay?
User3: Well, between you and me, I have experimented with some other guys from across the hall, but I'm not really sure. Don't tell any of the clan members though -.-
User2: Nah, I wouldn't do that. The reason I ask is I've done the same thing as you and I think I might really be gay.
User1: (f ;..;)f Rawr!