You already asked this question 2 days ago and got a pretty comprehensive answer - if you've forgotton already I suggest you re read what Clanad had to say!!!
Dee Sa - Chicago is known as 'the windy city' - this has nothing to do with the weather conditions but due to the amout of talking the politicians used to do in the 1930's - guess it is along the lines of 'talking a load of hot air..'