Meaning of fat cat

fat' cat'

Pronunciation: [key]
— Slang. Slang.
  1. a wealthy person from whom large political campaign contributions are expected.
  2. any wealthy person, esp. one who has become rich quickly through questionable dealings.
  3. an important, influential, or famous person.
  4. a person who has become lazy or self-satisfied as the result of privilege or advantage.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.