Any alcoholic beverage, the consumption of which is supposed to clear up one's hangover from previous drinking (but will tend to have the opposite effect in reality). Origins of the phrase date back to medieval times, when hairs from a biting dog were put in the bite wound in the belief that this promoted healing.
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".