Top Definition
1) The innate ability of Illinois residents with a "better than thou" attitude to upset other Midwesterners; especially those from Wisconsin, Michigan and Minnesota.

2) A state of mind of Wisconsin residents exacerbated when Illinois residents consider Wisconsin "Illinois' State Park".
"That FIB continues to Illannoy me". Aren't those FISTABS Illannoying?"
by Bajaskier June 11, 2007

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