It's a reference to my PBP hi-vis - in tribute to Audax England, Ecosse etc, I wrote Audax Darleaux* on the back of my council-issue hi vis for PBP. It was a really shoddy job in marker pen.
It's a joke guaranteed to be understood by, ooh, tens of people.
*after checking that "Darleaux" didn't translate into something vile in French