While having sex with a girl in the doggie style position with hands on her hips, one would slide thumb into girl's asshole and at same time say "DING DONG".
Same as definition for ringing the doorbell. give it a try and hold on for the ride.
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".