My Brother-in-Law is from rural Illinois near Mattoon.
He has some peculiar local inflections. For instance he pronounces Fish as Feesh and Creek as Crick.
Much of the early American settlement in that part of the state was from the southeast, so that linguistic influence is still evident. I knew a lot of more recent transplants from Tennessee, Arkansas, and southern Missouri. One of my favorite terms from down there, and I didn’t hear it much down there either, is “ foot feet.” No one outside of the area has ever had any idea what that means. — except for a coworker in Chicago. And it turned out she was raised around Mattoon. Foot feet are the clutch, gas, and brake pedals.