I taught in the actual CITY of St. Louis. Wow what an incredible year that was. Good and bad. Had a love/hate relationship with it... And my kids said fixin to/fiddin' to/fittin to, depending on the kid! Lots of variations.
I remember the Hoosier jokes. I lived on the IL side and there was a fun bar band called Hoosier Daddy...loved it! Hoosier was definitely used as an insult!