"Something that's so embarrassing, so deeply uncomfortable, or so discusting that your face contorts, you make noises like a constipated frog, and you get a feeling in your stomach, the feeling that you've got...
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.