Used on online gaming, this literally means Away From Keyboard. Used to say if somebody is inactive.

Away From Keyboard.

Slang for the acronym "Away From Keyboard." Used when a person will leave the computer and not do anything. Often happens in online games when a player is completely stationary and does not respond to greetings.

Away From Keyboard : often used in online gaming when someone is not moving they are assumed to be afk.

n. person who is currently away from keyboard
vb. the act of being the person stated above

It means: "Away from Keyboard", usually used in games.

Abbreviation for "Away From Keyboard" This, as well as other abbreviations were developed to speed up communication using 300 baud modems in the early to late 80's.