nos
n.— «Taking sly hits of nitrous oxide, or “nos” as it is known on the street, was once a fairly common practice among anaesthetists for whom it was a tool of the trade, Sharpe says.» —“Doctor rubbishes safe ‘nos’ claim” by Greg Meylan Stuff (New Zealand) Apr. 24, 2005. (source: Double-Tongued Dictionary)
Further reading
It was a dark and stormy night. So begins the long and increasingly convoluted prose of Edwards Bulwer-Lytton’s best-known novel. Today the annual Bulwer-Lytton Contest asks contestants for fanciful first sentences that are similarly...
Ron in Gloverville, South Carolina, wonders about the phrase since hatchet was hammer, which some use to mean “for a long period of time,” as in My family has lived here since hatchet was hammer. Another phrase he’s heard indicating the same thing...