Money possessed person who has his/her mind blinded by richness and acts like a stupid moron thinking that he/she is the king of the Universe - typically means people with ridiculously "bling-bling" appearance (tons of chains,golden teeth etc.), especially black rappers and hiphoppers. (Fusion of two idioms: "cash" and "asshole".)
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".