Sharp as a fiddle

The contributor’s father does not tolerate people who say and do dumb things. One of his neighbors recently said something very asinine and his father couldn’t abide. He derisively and sarcastically said the neighbor was “sharp as a fiddle”. This is mashup of “sharp as a tack” (very clever of intelligent) and “fit as a fiddle” (in good physical condition). This one is similar to others I have posted: “sharp as a whistle” https://malaphors.com/2025/02/05/sharp-as-a-whistle/ and “security is tight as a whistle” https://malaphors.com/2022/03/14/security-is-tight-as-a-whistle/

A big thanks to Verbatim for contributing this nice malaphor.