fat cat       
noun [ C often plural ]  disapproving uk/ˌfæt ˈkæt/ us/ˌfæt ˈkæt/
 大亨;阔佬;(尤指公司的)老板
someone who has a lot of money, especially someone in charge of a company who has the power to increase their own pay
  The report criticized boardroom fat cats who award themselves huge pay increases. 报告批评董事大亨们为自己大幅提薪。 
 fat cat bosses/directors 有财有势的老板/董事