In a fencing bout when you win 5-0, you have earned the right for your teammates to shout "Eat bagel!" as a celebration because 0 looks like a delicious bagel.
"They just swept 5-0?? LETS GO!! EAT BAGEL" - Your teammate after you win a bout 5-0
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".