A rich mother fucker. This is a individual who makes over $100,000 per year and holds substantial assets. They are also in short referred to as a RMF. These individuals are traditionally the least charitable and the most frugal.
"Hey Jon, I am doing the personal taxes for this Rich Mother Fucker, look at how much this fucking guy makes! And to boot, he only contributed $5 in donations to charity for last year! What a piece of shit!"