Something a rat likes as much as a big ole pile of garbage, it really doesn't matter to a rat how much garbage is in the pile. They're as happy as a pig in a pile of shit with their garbage, they disregard how nasty it really is.
Someone who is addicted to obtaining money and building wealth. A money addict and fanatic. Breadheads often work more than one full-time job, and some even participate in illicit activities to "obtain the bread".