Adr maxxing means: The practice of deliberately optimizing every in-game decision to maximize Average Damage per Round output - taking every trade, buying into every dueling opportunity, refusing to play passive when. 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.