This is the 3489th most frequent French word.
diable
Devil.
Here, 'diable' is used figuratively in reference to an equipment piece: it's nicknamed for its angular or intensive usability, such as a 'hand truck'.
Elle avait décidé de retirer la poussière avec un aspirateur diable.
She had decided to remove the dust with a wheeled vacuum cleaner.
The word 'diable' denotes a figurative expression to describe someone's intense or menacing appearance.
Avec son regard de diable, il m'intimidait lorsque je parlais.
With his devilish look, he intimidated me whenever I spoke.
The word 'diable' is used here as an exclamation referring to the devil, often indicating surprise or bewilderment.