This day in history: Roman Catholics in the United States would no longer be required to abstain from meat on Fridays, as a national conference of Roman Catholic cardinals, archbishops and bishops voted in Washington to revoke a requirement of abstinence that had been in effect for 11 centuries, on this day in 1966. As part of the recognition of Friday as a day of penance, Pope Nicholas I had decreed in the 9th century that adherents to Roman Catholic faith would be required to abstain from the eating of meat, although the consumption of fish on Fridays was permitted. Friday, December 2, 1966, would mark the first day that 45,000,000 American Roman Catholics could consume beef, chicken, pork, or other meats without violating Church doctrine. Philip Hannan, Archbishop of New Orleans, and Clarence George Issenmann, the Bishop of Cleveland, jointly made the announcement at a press conference.
George Carlin once joked: "It's not even a sin anymore to eat meat on Friday, but I'll bet there are still guys in hell doing time on a meat rap."
However, according to the National Catholic Register, "Contrary to common misconception, abstinence from meat on Fridays throughout the year has never been abolished from Roman law. It was not abolished by Vatican II. It was not abolished by Pope Paul VI or Pope St. John Paul II. It was not abolished by the 1983 Code of Canon Law. It remains the universal law of the Latin Church — even if not everyone has to obey it." Source