An ideal situation; splendid state of affairs •In earlier use fat city meant ''vulva'': You're in fat city while other poor slobs sweat on assembly lines/ Johnny came marching home from college and announced he was in ''fat city''(1960s+)
Poor physical condition, esp because of being overweight: Its principal characters wind up in ''fat city'' (argot for ''out of condition'')(1970s+)
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
Idioms and Phrases with Fat City
Also,Fat City. A condition or circumstance marked by considerable prosperity or having a superior advantage. For example, With that new job she'll be in fat city.
[ ; 1960s