Bulldust
Bulldust or bull dust is a fine red aeolian dust which is especially common in the Australian Outback. It is formed from dry particles which measure less than 2 microns and so form a choking cloud when disturbed. It is a particular hazard when driving as it may conceal dangerous potholes or reduce visibility.
Colloquially, in Australian slang, the term has become a bowdlerisation equivalent to the phrase "bullshit", meaning nonsense or rubbish, albeit with significantly less severity.
