Afk arc means: An AFK arc is a phase in someone's life - or a character's story - defined by a meaningful withdrawal from social, digital, or public spaces. Unlike a random disappearance, an AFK arc has. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.