guff vs hot air

guff

noun
  • Nonsensical talk or thinking. 

  • A fart; act of breaking wind. 

  • Superfluous information. 

  • Insolent or otherwise unacceptable remarks. 

verb
  • To mislead. 

  • To fart. 

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 guff and hot air occurred in a corpus of books? (source: Google Ngram Viewer )