Vous êtes des vrais Lulu?

This weekend I had a fabulous experience by watching a GTA4 competition at SPA Francorchamps,Belgium. Me and a friend arrived a little bit late...other friends very passionate about all Grand Prix competitions were there from the morning.

So.... 2 girls in a Toyota blue car, heading from Luxembourg to a GTA4 competition in Belgium. Before arriving to the circuit, we noted a barrier were you were stopped to pay a parking fee.

A funny conversation followed:
Girls:"Bonjour, le circuit c'est loin?"
One of the guardians:"Non,c'est 3.2 km,mai vous devez payer 8 euros pour le parking. Vous êtes des vrais Lulu?".
Girls:"C'est quoi "Lulu"?"
One of the guardians:"Luxembourgeois".
Girls: "Non, nous ne sommes pas luxembourgoises".
One of the guardians:"Donc vous travaillez en Luxembourg et vous avez des plaques Luxembourgoises pour la voiture?"
Girls: "Oui monsieur. Au revoir.".

Translation of the meaning of his question concerning "des vrais Lulu"....a little bit sensitive...come in Luxembourg and you will understand :))))