J-Dub
n.— «The SY’s, as the community members call themselves (pronounced “ess-why”—it’s a shorthand for “Syrian”)…came to derisively refer to the Ashkenazim as “J-Dubs,” a play on the first and third letters of the English word “Jew.”» —“The Sy Empire” by Zev Chafets New York Times Oct. 14, 2007. (source: Double-Tongued Dictionary)
Further reading
Need a slang term that can replace just about any noun? Try chumpie. If you’re from Philadelphia, you may already know this handy placeholder word. And there’s Queens, Brooklyn, Staten Island, Manhattan, and … The Bronx — why do we add...
Diamond dust, tapioca snow, and sugar icebergs — a 1955 glossary of arctic and subarctic terms describes the environment in ways that sound poetic. And a mom says her son is dating someone who’s non-binary. She supports their relationship, but...
“J-Dub” is also used by Mormon missionaries (and perhaps others?) to refer to their principal rivals, Jehovah’s Witnesses.