A much more fun way of expressing the adjective/adverb "seriously."
People should try it at least once in their lifetime; toss it out there. And, while you're at it, try out other non-words like "foo" and "jank." They make life so much more entertaining, at least for oneself if not for anyone else.
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".