When you dislike someone so much that anything they do, no matter how minor or inoffensive, annoys you beyond any rational level - exemplified by the sentence "look at that bitch eating crackers like she owns the place".
A bitch eating crackers is someone (male or female(but usually female)) who no matter what they do like eating crackers pisses you off. Usually has a low IQ or intelligence. Other versions of the phrase include Bitch eating chicken.
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".