"ballyboe" means: A historical Irish land-measurement term used in Ulster, referring to a unit of land equivalent to a townland or a subdivision of one. The w.... 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.