Abnormie szn means: A cultural moment or time of year when eccentric, offbeat behavior is especially celebrated or visible - used to describe periods when the weirdos collectively feel most seen and validated, like. 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.