A house in the South with only one room, small and simple enough that you could shoot a shotgun in one door and out the other. (Improvement on previous definition)
After Katrina, people who had real homes are building shotgun houses because the insurance companies are screwing them over.
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".