Completing a certain a task under stipulations that can only be considered as pure masochism, mad love, passion, testosterone, inability to resist the urge to scream at the top of your lungs every passing second while never losing focus and being hard while doing it. Also people who are capable of such acts go to sleep at night only to fight their demons and win the made up arguments they thought about as they shower(once a month) while simultaneously dreaming about horses having wild butt sex.
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".