This is a gangster or drugdealer from the rio grande valley. It comes from the word valley and the word pachuco from the pachucismo or cholismo of east L.A. area. But used in south texas to proclaim you are from the valley and live crazy.
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".