AFK [MUD] Abbrev. for "Away From Keyboard". Used to notify others that
you will be momentarily unavailable online. eg. "Let's not go kill that
frost giant yet, I need to go AFK to make a phone call". Often MUDs will
have a command to politely inform others of your absence when they try
to talk with you. The term is not restricted to MUDs, however, and has
become common in many chat situations, from IRC to Unix talk.