I’m sure all the Illinois FReepers will appreciate your kind words.
It’s well known that it is called that. Google it.
I lived around there many years ago.
http://www.google.com/search?sclient=tablet-gws&site=&source=hp&q=peoria+armpit&oq=peoria+armpit&gs_l=tablet-gws.12..0i22i30.5763.12713.0.14182.15.15.0.0.0.0.1110.1181.1j7-1.2.0....0...1c.1.64.tablet-gws..13.2.1180.9FzgQIDN3TQ