You: Learning dawg, so fucking boring
Bro: Well remember the 90/20 rule.
You: What's that?
Bro: 90 minutes of work, 20 hours of jerking off.
90/20 rule can be used on anything.
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".