An envelope containing faeces (shit), the primary purpose of which is to upset its recipient. Could be thought of as a harmless relation to the letter bomb. Sending one most likely constitutes mail fraud in most jurisdictions.
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.