Is it Chicago? I used to hear it was Johnny Carson's Nebraska flat accent. To my ear, the Chicago accent is represented but exaggerated in the "Bill Swerski's

Is it Chicago? I used to hear it was Johnny Carson's Nebraska flat accent. To my ear, the Chicago accent is represented but exaggerated in the "Bill Swerski's Superfans" sketches from SNL in the 1990s - "Da bearssss". And it's "cur-muhl". :)