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Yinzer is a 20th-century term playing on the Pittsburgh, Pennsylvania second-person plural vernacular "yinz." The word is used among peoples who identify themselves with the city of Pittsburgh and its traditions.
The term originally was used to identified the typical blue-collar Pittsburgh citizen who often spoke with a heavy Scots-Irish "Pittsburghese" accent. Typical of the time, the words yinz/yunz/you’uns would be used by less sophisticated industrial immigrants as a second-person plural pronoun. Over time, the word was used by many Pittsburgh residents to self-identify, even if they didn't speak with a thick accent. During the later decades of the 20th century, as Pittsburgh experienced dramatic industrial blight and net population decreases, the term Yinzer faded from common use.
The concept and use of the word gained increased use in the 21st century as the area's population loss slowed, and the city began to be a hub for revitalization. As the city regained note for being a desirable place to live, more outsiders moved or returned to the Pittsburgh metropolitan area. As a result, the term took on a slight pejorative connotation to identify someone who, for better or worse, is either a lifelong Pittsburgher, or someone who commits an act that would stereotypically be identified as something a traditional Pittsburgher would do.