A person who thinks that they are the greatest teacher in the world and like to call people idiots.
Commonly a maths teacher and a science teacher.
"I do not teach idiots and YOU ARE AN IDIOT!!"
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".