Aggieland arc means: The personal transformation journey someone undergoes through their time in and around Aggieland - the story of going from an outsider or skeptic to someone who is fully, irreversibly part of the. 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.