boo word n. an expression or term that represents a topic that is unpopular or unwelcome. Editorial Note: The antonym is hurrah word (also spelled hooray word). In recent years, both boo word and hurrah word are more common in the United Kingdom, Australia, and New Zealand than they are in North America. Etymological Note: Though, as in the 1900 citation, the form bugaboo word is occasionally used, the origins of boo word are probably not in a clipping of bugaboo but by reference to the effect of the word on observers, either because it causes them to boo and jeer in response, or because they are startled or scared as if someone has shouted “boo!” (source: Double-Tongued Dictionary)
Further reading
When you had sleepovers as a child, what did you call the makeshift beds you made on the floor? In some places, you call those bedclothes and blankets a pallet. This word comes from an old term for “straw.” And: What’s the story...
To fossick meaning “to rummage about,” derives from the use of fossicking for the practice of literally digging about for gemstones in abandoned mining excavations, a hobby that’s particularly popular in Australia and New Zealand...