know one's ass from a hole in the ground

Meaning: (idiomatic,vulgar)To have anadequatelevel ofknowledgeorskill; to understand what one is doing or talking about.2004,David Drake,The Reaches‎[1],→ISBN:"Why are you so sure and they aren't?" the landsman said. . . ."Because Mr. Ricimerknows his ass from a hole in the ground, sir."2005June 12,Gary M. Pomerantz, “First Chapter:Wilt, 1962”, inNew York Times, retrieved26 July 2014:Foxx gave a comic's pause. "Just goes to show you, don't it? Some folks don'tknow their ass from a hole in the ground."2006December 5, David Kiley,Chrysler "Whoops" Ads Part of Important New Genre‎[2], Bloomberg, retrieved23 September 2016:In the unofficial ad, the facilitator says about the man whose wife will be replaced, “This guy wouldn’tknow his ass from a hole in the ground.”

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