😌 means: The relaxed face emoji. Relieved, satisfied, mildly smug. Used after hard work is done, a plan lands, or to close a humblebrag with contentment. "Got the job 😌" does more narrative work than any. 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.