a person (often a pre-teenmale) who farts in a bathtub so that they might bite the bubble it produces.
John, a legendary wiffer sniffer, leaned back in the bathtub with well-practiced ease and farted, then just as quickly, leaned forward again and bit the bubble.
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".