talk out of one's ass

• talk out of one's arse (UK)

• Audio (General Australian):

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talk out of one's ass (third-person singular simple present talks out of one's ass, present participle talking out of one's ass, simple past and past participle talked out of one's ass)

1. (Canada, US, idiomatic, vulgar) To exaggerate, lie, or speak nonsense.
   • 2016 April 7, Brendan Gauthier, “‘Talking out of his ass’: Stephen Colbert loses patience with Donald Trump’s ignorance”, in salon.com, retrieved 6 December 2017:

     "We looked it up," Colbert said. "And the Department of Environmental does not exist, meaning Trump is either talking out of his ass or he's already eliminated it."

• (general):
  • bullshit (verb)
  • talk out one's ass
  • talk out of one's ear (euphemistic)
  • talk through one's ass
  • talk through one's hat
  • whistle in the dark
• (in lieu of occupational competence):
  • fake it till one makes it

• pull out of one's ass