Actioning maxxing means: Going absolutely all-in on getting things done - optimising every hour for maximum output, turning your entire existence into a productivity machine, and treating the completion of tasks as a form. 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.