1 definition by CAR_
A provincial, typically residing in the western half of Pennsylvania (USA), who strongly identifies with the nearby city of Pittsburgh, Pennsylvania, often due to a fervent, pseudo-religious loyalty toward one or more professional sports teams headquartered there. "Yinzers" are so called because they speak a regional dialect of American English featuring the use of "yinz" or "yunz" as the second-person plural pronoun. Yinzers are the subject of a number of stereotypes, some of which they are actively proud and consciously reinforce to strengthen their sense of identity, an example being their use of French fries as a condiment.
Traffic in Pittsburgh is very bad this afternoon; a veritable army of YInzers has descended on the city due to the baseball game.
by CAR_ July 4, 2018