The shine comes from fucking someone so good that the oral/vaginal juices leave the genitalia shining. The “shine” reference is a remembrance of shoe shines. That’s how shiny the results will be since they want them so badly.
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".