not know one's ass from one's elbow

idiom

Definition of not know one's ass from one's elbow

chiefly US, informal + impolite
: to know nothing : to be stupid Don't take his word for it—he doesn't know his ass from his elbow.

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“Not know one's ass from one's elbow.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/not%20know%20one%27s%20ass%20from%20one%27s%20elbow. Accessed 13 Aug. 2020.

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