Yap core means: An aesthetic and personality archetype built entirely around the love of talking - featuring people who treat conversation as performance art, narrate their own lives out loud, and treat 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.