Based core means: An aesthetic or lifestyle identity centred on radical authenticity - the 'based-core' person wears what they want, says what they think, consumes what they enjoy without ironic distance, and. 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.