sharp like a rock

Definition

A sarcastic way of saying someone is not particularly bright or quick-witted. It's the verbal equivalent of a dull blade—blunt and ineffective.

Example Usage

He thought Australia was a country in Europe; that guy's sharp like a rock.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=sharp%20like%20a%20rock&defid=292269)

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