Green’s Dictionary of Slang

success, wealth, often from criminal activities.

[1961		Wash. Post and Times Herald 13 Apr. A1: ‘Wow, this is Easy Street in a fat city,’ said a white Peking duckling, lying back Maharajah-style].
1963		F. Kohner Affairs of Gidget 62: He’s living in fat city [...] accosted by all the hot tickets in college town to hit the sack with them.
1974		J. Lahr Hot to Trot 19: I wanted to go back to America feeling in fat city.
1985		B. Humphries Traveller’s Tool 18: Our home-grown Oz fillum producers were on Easy Street, Fat City.
1997		E. Little Another Day in Paradise 241: You guys hit these motherfuckers it’s fat city.
2005		Expressions mag. Mar.–Apr. 🌐 All you need for these stamps are your acrylic blocks and you’re in Fat City, baby.