"deadstock" means: Merchandise that has not yielded any use yet: from the view of the businessperson, one that has failed to be sold or processed and is now st.... 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.