Agent maxxing means: The act of maximizing one's autonomous hustle and self-directed productivity to an almost obsessive degree, often implying someone is doing everything themselves, delegating nothing, and operating. 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.