"Ce n'est pas français," he said.
After checking, we found that the expression is Cajun French--a literal translation of "let the good times roll" and specific to New Orleans Mardi Gras festivities. (Lazay Lay Bon Tom Roulay is how its pronunciation is liltingly treated in most New Orleans publications.)
Nonetheless, it's not a proper French construction and, therefore "not said" here in France. How many times have I heard that quintessential retort, "Ça ne se dit pas." That's not said.
Peu importe, bienvenue au club. No matter, welcome to the club.
Ce n'est pas français: That's not French.
Lycée: secondary school
Lycéen: secondary school student
For more about the Alliance Française d'OKC: http://afdokc.org/
Mardi Gras 2011 falls on March 8.