Wait, Verlan is l'envers, stromae is maestro... Is this Verlan thing just like Rioplatense Spanish's Vesre? (Vesre basically means revés i.e. inverse)
EDIT: Just looked it up on Wikipedia and it turns out this phenomenon happens in a number of languages: Riocontra in Italian (riocontra -> contrario), Podaná in Greek, Šatrovački in Serbia, Totoiana in Romanian.
xkcd #2942: Fluid Speech ( imgs.xkcd.com )
xkcd #2942: Fluid Speech...