Yinz's a second-person plural pronoun used mainly in southwest Pennsylvania, including Pittsburgh, but it's also found throughout the Appalachians. (See: Pittsburgh English.) Yinz's the most recent derivation from the original Scots-Irish form you ones, which's probably the result of contact between Irish and English. When standard-English speakers talk in the first person or third person, they use different pronouns to distinguish between singular and plural. In the first person, for example, s… (More on Yinz)