humbugism

A dated slang noun meaning the practice of humbug — deliberate deception, nonsense, or fraudulent talk intended to mislead or impress. Where 'humbug' is the act or the thing itself, 'humbugism' frames it as a system or philosophy, lending a mock-academic air to the idea of professional nonsense-peddling. Particularly fitting for describing the elaborate self-serving rhetoric of politicians, con artists, and anyone who has elevated the art of talking rubbish into a lifestyle.