Translates directly (from norwegian) to field mattress. A field mattress is what is used when not back at base camp (when you're out camping in the woods etc.)... Feltmadrass is commonly used in the norwegian army as a replacement for army girls who have been sleeping around.
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.