"Lache aller!". Every Mardi Gras in the rural areas of south Louisiana, communities would gather around and chant "La Vielle Chanson de Mardi Gras". During the event known as the "courir", some of the participants will dance around to the playing of a Cajun accordion, simply known as the Mardi Gras dance.

Read more: http://earlycajunmusic.blogspot.com/2014/11/mardi-gras-dance-aldus-roger.html


NOTE: I"ve only seen reference to the spelling "Lache aller". However, Bryan alerted me to an alternate spelling: "lachez-les".