The term originates from The Last of Us 2, where a character that said something bigoted to Ellie, one of the protagonists, and made her steak sandwiches as an apology. In the same scene she passes the given sandwiches on to another character, who reacts positively to the gift.
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".