This expression would be used by someone who has a degree of uncertainty about whether they have an urge to fart or whether he or she mightactually shart or fully shit themselves.
I'm either about to toot or shoot right now, shall I risk it anyway?
I just finished my second bowl of nachos and I can't tell if I'm about to toot or shoot.
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".