"boom pipe" means: A musical instrument made from a piece of pipe blown in at one end to provide the bass in the folk music traditions of Antigua and Barbuda a.... 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.