From title of 1965 single, "I'm Rowed Out," by punk garage band, "The Eyes." Means: you put all your time and effort into something (or someone), and it was all for nothing; you ended up depleted, exhausted, and unappreciated.
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".
I don't buy the schmegegge about Morty sleeping with Moira.
His version of the story was pure schmegegge.
The whole schmegegge was made up to get Liz a little bit of attention.