When something is real messed up. Also, when something goes wrong and people laugh that would also be mad grimey. And when something isn't right. Also, when sumptin is not supposed to be funny but is.
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.