A large, often excessive amount of pennies, so that there are so many pennies that you attempt to make up for the large amounts of pocket change by contracting the words "plenty" and "pennies."
Friend 1: Hey all I have is a dollar and with tax this costs $1.08. Does anybody have any change?
Friend 2: Of course, I have plennies, would you like some?
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".