Quite good means: A classic piece of British understatement where 'quite good' actually means something is fantastic, brilliant, or top-notch. In the UK, saying something is 'quite good' is essentially high praise. It has drug-related associations; worth a calm conversation about which side of the topic your teen is on. 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.