Laissez les bons temps rouler
The expression Laissez les bons temps rouler (alternatively Laissez le bon temps rouler, Laisser les bons temps rouler and Laisser le bon temps rouler, French pronunciation: [lɛse le bɔ̃ tɑ̃ ʁule]) is a Cajun French phrase that is literally translated from the English expression "Let the good times roll."
This phrase is often mentioned in Louisiana and around the Gulf Coast where Mardi Gras is celebrated. It is well known touristically around the United States from television and radio. It is not an expression used in other French-speaking countries.