Jizz Nugget refers to Jizz that is pure white in color, the size of a penny and comes out of your ass. It is mainly used as an insult, or just randomly said in dead silence.
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.