not know (one) from a hole in the ground
not know (one) from a hole in the ground
To not know who one is just by looking at them; to have never met one before. Even though Jake had worked at the company for nearly 10 years, the boss still didn't know him from a hole in the ground. I don't blame them for not giving me permission right away. They don't know me from a hole in the ground.
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