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A fallout shelter is an enclosed space that is designed to protect people from fallout and debris from a nuclear explosion. Many of these were built during the Cold War.
In the alternate timeline where an elderly Biff Tannen traveled from 2015 to 1955 with a Grays Sports Almanac to make himself rich, he had a fallout shelter built underneath his mansion. However, he didn't use it for its intended purpose — instead filling it with pictures and sculptures of Lorraine Baines McFly, the woman he had been obsessed with since high school.
In 1972, when Biff Tannen's second wife, Jayne Mansfield, discovered the shrine to Lorraine, she angrily left the mansion and told Biff that their relationship was over.
