a rich person, especially someone who does not deserve to be rich:
• Pilots have a bad image among their co-workers, who view them as fat cats who earn higher salaries.
• corporate fat cats and their big bonuses
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fat cat UK US noun [C] DISAPPROVING
► someone who has made a lot of money, especially without working hard for it or by not caring about their workers, customers, etc.: »
There is a lot of public anger about corporate fat cats and their huge bonuses.
Financial and business terms. 2012.