Adulting szn means: That annual or semi-annual stretch when the mundane demands of adult life arrive in one overwhelming cluster - tax season, lease renewals, insurance renewals, performance reviews, and every. 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.