know one's ass from a hole in the ground

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English

Alternative forms

Verb

know one's ass from a hole in the ground (third-person singular simple present knows one's ass from a hole in the ground, present participle knowing one's ass from a hole in the ground, simple past knew one's ass from a hole in the ground, past participle known one's ass from a hole in the ground)

  1. (idiomatic, vulgar) To have an adequate level of knowledge or skill; to understand what one is doing or talking about.
    • 2004, David Drake, The Reaches, →ISBN:
      "Why are you so sure and they aren't?" the landsman said. . . .
      "Because Mr. Ricimer knows his ass from a hole in the ground, sir."
    • 2005 June 12, Gary M. Pomerantz, “First Chapter: Wilt, 1962”, in New York Times, retrieved 26 July 2014:
      Foxx gave a comic's pause. "Just goes to show you, don't it? Some folks don't know their ass from a hole in the ground."
    • 2006 December 5, David Kiley, Chrysler "Whoops" Ads Part of Important New Genre, Bloomberg, retrieved 23 September 2016:
      In the unofficial ad, the facilitator says about the man whose wife will be replaced, “This guy wouldn’t know his ass from a hole in the ground.”

Usage notes

  • Almost always used in negative constructions to describe someone's ignorance or stupidity, such as: He doesn't know his ass from a hole in the ground.

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