or fat city
an easy and prosperous condition or circumstance: With a new house and a better-paying job, she's in Fat City.
Origin of Fat City
First recorded in 1960–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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. [Slang; 1960s] Also see easy street.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.