An extreme moron. This term was not coined by Bugs Bunny, who only used the term maroon, and then only once. Ultramaroon was a favorite term of "The Champ", a longtime Canadian syndicated radio feature.
"The ultramaroon goes for the head fake. Uppercut, straight right, and a flurry to the solar plexus. 'How's that?" -The Champ
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.