fumée grise, ou en anglais: grey smoke. An alias, which seems to be perfectly fitting for the "grey one".
It's an hommage to his first club experiences, which have heen shaped by darkness and a lot of smoke. It's a symbol for the intangible and the "unknown in the music" that touches you and makes you dance. And it's also a nod to all the french labels which remarkably shape the sound of fu..