"nuzzer" means a nuzzer is a historical anglo-indian term for a gift or token of tribute presented to a social superior — the kind of formal offering that accompanied any significant encounter with someone of higher rank in colonial-era india. It is one of many casual words teens pick up from friends, social media, music or sport, and on its own it carries no particular warning. If you hear your teen use it, it is fair to ask what they mean by it in their friend group, since meanings drift quickly. Asking out of curiosity rather than alarm tends to keep the conversation open and useful.