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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.
"Yinzer" was historically used to identified the typical blue-collar people from the Pittsburgh region who often spoke with a heavy Pittsburghese accent. The term stems from the word yinz, a second-person plural pronoun, brought to the area by early Scots-Irish immigrants. Over time, yinzer has been used by many Pittsburgh residents to self-identify, even if they didn't speak with a thick accent.
The concept and use of the word gained popularity in the 21st century as the area's population loss slowed, and the city became a hub for revitalization. As the city gained note as a desirable place to live, more outsiders have moved or returned to the Pittsburgh metropolitan area. The term has taken on a slight pejorative connotation to identify someone who, for better or worse, is either a lifelong Pittsburgher, or who commits an act that could be identified as something a less "sophisticated", stereotypical Pittsburgher might do.