Used in the Wilco song I Am Trying To Break Your Heart. Jeff Tweedy is saying that he is a heavy drinker. A figure of speech meaning he drinks as much as an aquarium could hold.
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.