air supply
n.— «We thought you should be given a quick taste of the fiddles his Ugandan counterpart uncovered. For bagmen, brothels, bookmakers and bribes read “air supply.”» —“Regular Shorts” by Paola Totar Sydney Morning Herald (Australia) July 4, 1989. (source: Double-Tongued Dictionary)
Further reading
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...
Have you ever googled your own name and found someone else who goes by the very same moniker? There’s a word for that: googleganger. Plus, the language of hobbyists and enthusiasts: If you’re a beekeeper, perhaps you call yourself a...