Nalayak means: A South Asian insult for someone utterly useless - a good-for-nothing who can't be relied on for anything. Nalayak cuts deep in cultures where family expectations and duty are core values; to call. 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.