"ullaloo" means: An Irish word for a loud cry of grief or lamentation — the kind of wailing, keening sound associated with mourning at funerals in traditiona.... 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.