A gronkadonk is usually a crabby old man/woman that barks at children the way a dog barks at a mailman. Most often, it is directed at teachers that have been around since the late cretaceous period, and act as such.
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".