fat city fat city {n.}, {slang} A state of contentment due to wealth and position. Bully for the Smiths; they have arrived in Fat City. Categories: add yours {n.} {slang} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: F Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Add my comment