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The low-budget second part of a movie theater's double feature. Back in the days of double features, movie houses showed two very distinct types of films. A movies were the hits—“Gone With the Wind,” “Casablanca,” “Citizen Kane,” “The Wizard of Oz”—the ones that drew patrons to the movie houses. Then there were Westerns, horror flicks, and science fiction movies that didn't cost very much to make (they were often in black-and-white). These B movies tended to be shown before the main feature; otherwise, people would leave after the A picture and then feel they hadn't gotten their admission money's worth. As double features disappeared and the cost of filmmaking grew, the curtain went down on the B movie genre.
See also: movie