Mardi Gras, literally “Fat Tuesday,” has grown in popularity in recent years as a raucous, sometimes hedonistic event. But its roots lie in the Christian calendar, as the “last hurrah” before Lent begins on Ash Wednesday. That’s why the enormous party in New Orleans, for example, ends abruptly at midnight on Tuesday, with battalions of streetsweepers pushing the crowds out of the French Quarter towards home.
Carnival comes from the Latin words carne vale, meaning “farewell to the flesh.” Like many Catholic holidays and seasonal celebrations, it likely has its roots in pre-Christian traditions based on the seasons. Some believe the festival represented the few days added to the lunar calendar to make it coincide with the solar calendar; since these days were outside the calendar, rules and customs were not obeyed. Others see it as a late-winter celebration designed to welcome the coming spring. As early as the middle of the second century, the Romans observed a Fast of 40 Days, which was preceded by a brief season of feasting, costumes and merrymaking.
There are well-known season-long Carnival celebrations in Europe and Latin America, including Nice, France; Cologne, Germany; and Rio de Janeiro, Brazil. The best-known celebration in the U.S. is in New Orleans and the French-Catholic communities of the Gulf Coast. Mardi Gras came to the New World in 1699, when a French explorer arrived at the Mississippi River, about 60 miles south of present day New Orleans. He named the spot Point du Mardi Gras because he knew the holiday was being celebrated in his native country that day.
Mardi Gras literally means “Fat Tuesday” in French. The name comes from the tradition of slaughtering and feasting upon a fattened calf on the last day of Carnival. The day is also known as Shrove Tuesday (from “to shrive,” or hear confessions), Pancake Tuesday and fetter Dienstag. The custom of making pancakes comes from the need to use up fat, eggs and dairy before the fasting and abstinence of Lent begins.
Above all from Catholic Roots of Mardi Gras.