"NEX" means: , a department-store chain operated by the United States Navy exclusively for the military and their families, allies, and certain other ind.... This is a fairly neutral word with no inherent risk attached. There is no real cause for parental concern; it is descriptive vocabulary rather than something dangerous. If your child uses it, context will usually make the meaning clear. A brief, curious question about where they heard it is generally enough to know whether to follow up.