This was used as a line in the show 'MAD TV' in one of the sketch's on the show. Its a spin off of "give me liberty or give me death!". Usually used by the dimmer white-trash man who didn't pay attention in Social Studies/History enough to understand the depth of the actual saying.
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".