'Lemme pet your squirrel' is meant to say to someone who has an attractive moustache, and you just want to touch it. Preferably, pet it. Also, it is as bushy or curly as a squirrel's tail.
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.