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Thesaurus: know one's ass from a hole in the ground

know one's ass from a hole in the ground (idiomatic, vulgar) To have an adequate level of knowledge or skill; to understand what one is doing or talking about.

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Definitions

  1. know one's ass from a hole in the ground (idiomatic, vulgar) To have an adequate level of knowledge or skill; to understand what one is doing or talking about.