"baby boomer" means: A person born in the postwar years, generally considered in the United States and other Allied countries as between 1946 and the early 1960s.... 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.