spoken by Harry Callahan played by Clint Eastwood, in Dirty Harry.
It means that the speaker would be very happy if you continue on with your actions or behaviour because he/she could react in a manner that would be extremely pleasurable to them.
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".