AFK

Away From Keyboard -or- A Free Kill
Found on http://www.netlingo.com/acronyms.php

afk

away from keyboard
Found on http://www.noslang.com/dictionary/a/

AFK

away from keyboard
Found on http://www.lagkills.com/gaming-acronyms.htm

AFK

Away from keyboard
Found on http://www.chatslang.com/terms/online_gaming

AFK

Short for `away from keyboard`
Found on http://www.ruf.rice.edu/~kemmer/Words04/usage/slang_internet.html
No exact match found