Action maxxing means: The practice of optimizing every moment for maximum output and decisive movement - taking the bias-toward-action philosophy to its logical extreme. Someone who is action maxxing isn't just being. 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.