Every day, the online Merriam-Webster dictionary chooses a “Word of the Day.” Yesterday it was “nobby,” which M-W defined as “cleverly stylish; chic, smart.” It derives from the noun “nob,” meaning a person of wealth or social distinction. (Interestingly it doesn’t appear to be etymologically related to “snob.”) There was no mention of the word being a Britishism, but it is. It doesn’t appear in the archives of the New York Times, and the only quote M-W gives is from the British magazine The New Statesman: “Sponsorship of nobby events seems to be the favourite PR trick for City firms in the soup.”
Similarly, almost all the citations in the Oxford English Dictionary are from British sources. The exceptions are the American Anglophiles Cole Porter (“Nowadays it’s rather nobby/To regard one’s private hobby/As the object of one’s tenderest affections”) and S.J. Perelman (“A serried row of floodlit edifices..trumpeted to the newcomer that he was in the nobbiest winter playground ever devised”).
Incidentally, the OED notes in its definition that the word is “In later use depreciative,” that is, mocking. Merriam-Webster appeared to be unaware of this and took some heat on Twitter: