<holds up hand> It’s evidently an Indiana thing too. I’d never heard it growing up in Michigan. I moved to NE Indiana and it’s all over.
Not trying to be offensive here: Since you said it’s in Pennsylvania, I wonder if it’s got anything to do with proximity to Amish / Plain people? Maybe a usage common to their speech that’s entered general speech in the area? Because we’ve got a lot of Amish here as well.