Chain-snatch means: To snatch a gold chain (or sometimes a silver chain) from a woman (or a man) and run away.. It is mainly Indian English and may not be understood outside that context. 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.