This is the 3489th most frequent French word.
diable
Devil.
The word 'diable' is used here as an exclamation referring to the devil, often indicating surprise or bewilderment.
Qu'est-ce que tu fais là, au nom du diable ?
What are you doing there, in the name of the 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.