Its like one of those words you say when you stub your toe instead of saying a curse word like poop or frak and stuff like that. You also call people "flupkerks" when they are being an annoyance or a pest.
"Ow Flupkerk! I just stubbed my toe!"
" Bro, your kinda being a flupkerk right now so stop".
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".