Especially in gaming, if someone is not on the computer, but is still online, we call him or her Away From Keyboard, short as AFK.
Prof. Gaming: I tricked my hungry brother by talking food stuff to him, and he was eventually distracted to the refrigerator downstairs. While he was AFK, I made a Redstone Flying Machine (we were playing Minecraft) and sent him off to the world border.
A term used by adolescent gamers to let their friends know that they will be unreachable for a bit. Most the time "afk" is used as a discreet way to say, "I will be right back, I am going to go masterbate for a bit." Creating the new popular meaning of AFK, "Another Fap Kill".
AFk - Away from Keyboard
The next annoying thing from people going on an IM and putting busy straight away then going 30 minutes later i mean WTF. Avoid doing this unless you truely have a life or you want to play hard to get.
(1)
Dude that has a life - BRB guys dnt stat yet i got to feed the cat/baby/self
*'Dude that has a life' set his status to afk*
(2)
*Egotistic has signed in*
Decent person - Hey dude/babe hows it going
*Egotistic has set her/his status to away*