An extremely common colloqulism in the UK, meaning to be extactic with ones choices and actions.
Next time you nail that presentation at work or knock a minute off your mile run, tell a friend that you’re “chuffed to the muff,” aka very pleased with yourself.
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".