not know (one's) ass from a hole in the ground

not know (one's) ass from a hole in the ground

rude slang To be exceptionally stupid, naïve, or dimwitted. I'm not surprised to hear that she got lost two blocks away from her house—she doesn't know her ass from a hole in the ground. Our prime minister wouldn't know his ass from a hole in the ground, so why do we think that he'll handle this negotiation with any amount of success?
See also: ass, ground, hole, know, not

not know one’s ass from a hole in the ground

tv. not to be knowledgeable; not to be alert and effective. (Usually objectionable.) That stupid son of a bitch doesn’t know his ass from a hole in the ground.
See also: ass, ground, hole, know, not
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