Green’s Dictionary of Slang

furphy n.

also firfie, urph, pferfy
[proper name John Furphy, the proprietor of sanitary carts used by the Australian forces in WWI; the gossip and chat around these carts developed into the general word. Furphy, a former ironfounder, made his carts of iron, and on them was inscribed ‘Good, better, best, / never let it rest, / till your good is better / and your better best.’ The same slogan was also inscribed in Pitman’s shorthand. Note UK services, Elsan gen, a rumour, lit. news from the chemical toilet]

[1910s+] (Aus.) a groundless rumour; thus furphy-king/-monger n., a gossip.