Origin of Phrases - F
Fat city
Meaning: To have luxuries.
Example: When I land my movie contract we will be in fat city.
Origin: This is a type of slang that adds city to a word to indicate a "location" of some condition -- "if you do that you'll end up in trouble city." And of course "fat" has been used for centuries as a synonym for rich and well-to-do people. From the fact that only the rich had the money to buy the food and the servants to do the work -- both things adding to their size.
The idea that gout is a rich-man's disease is from the rich foods of the wealthy contributing to the medical condition.