taken from the reference to MacDaddy, which he isn't. MattDaddy is a blogger who talks about his kids, being a father/husband, technical stuff, and the Boston Redsox
A MattDaddy is someone who is devoted to his family, a good father, and a good enough husband for the wife to tolerate his sorry stinkin butt.
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".