The act of doing too many intellectual/ thinking required activities in a short period of time. This causes an immense amount of strain on the mind, instead of dealing with the problems at hand the mind committs suicide by shuting off and leaving the victim incapable of completing a thought.
Juan: "Omg I heard your taking 3 SAT subject tests tomorrow."
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".