headache bar n. a tube or beam suspended horizontally so as to block or bang against vehicles that are too tall for passage; a vehicle‘s roll bar or headache rack; any horizontal tube or beam with which a person could collide. Editorial Note: The Historical Dictionary of American Slang dates the near-synonym headache post to 1887. (source: Double-Tongued Dictionary)
Further reading
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Cat hair may be something you brush off, but cat hair is also a slang term that means “money.” In the same way, cat beer isn’t alcoholic — some people use cat beer as a joking term for “milk.” And imagine walking on a...