For many, especially in the Southern US, it means the person referenced is an ignoramus . That is, if the person had their shoes shined. they could easily be fooled by the shine man who could just as well put shit on their shoes as shoe polish
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".