bulldust vs hot air

bulldust

noun
  • Nonsense; blatantly false statements. 

  • Fine red dust, found in desert regions of Australia. 

hot air

noun
  • Empty, confused, or exaggerated talk lacking meaning or substance; bluster. 

  • Air that has been heated, especially so as to function as the lifting agent of a hot-air balloon. 

How often have the words bulldust and hot air occurred in a corpus of books? (source: Google Ngram Viewer )