Canada· hard· informal
épais dans le plus mince
“thick in the thinnest part”
Meaning
utterly lacking in common sense
Explanation
In Quebec, 'épais' is both the ordinary word for thick and a well-worn insult for someone slow on the uptake. The full phrase pushes it further: at their very thinnest, this person is still thick.
Example
Il a encore oublié les clés dans l'auto, il est épais dans le plus mince.
He's locked the keys in the car again, the man's a complete fool.
Origin
Quebec French already used 'épais' on its own as an insult. The 'dans le plus mince' tail is the joke added on top.
Where
Quebec
Source
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