When someone is in a chatroom, or a messenger program when they just stop responding. Usually they have an awkward conversation and it's their attempt to avoid it. Other times they went to the restroom or to do something really quick.
Vagiquita: How you doing girl?
Shaniqua: Great, just watching tv.
Vagiguita: I heard about the new guy in your life, how is he? His names Nahoejay right?
5 minutes Vagiquita: Shanni? You there?
Vagiquita: Bitch you went FAFK I know you're there...