To do a David; when you're undertaking any boring or monontanous task. Derived from the name David - that guy who drives an orange Renault Megane but calls it African Sunset.
What you get up to this weekend? Oh, just doing a David. What's that? You know, To Do a David; planting the front garden border, insulating the loft, washing the Megane.
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".