In the movie "Back to the Future," Biff's goons use the term "reefer addicts" to refer to the black musicians performing on stage. The term "reefer" is a slang term for marijuana, and "addicts" implies that the musicians are habitual users of the drug.
The scene in question takes place in the first "Back to the Future" movie, set in the 1950s. During this time, marijuana was widely stigmatized and demonized, particularly in conservative communities. It was portrayed as a dangerous and addictive drug, leading to negative stereotypes and misconceptions about those who used it.
The use of the term "reefer addicts" in the movie is a reflection of the historical attitudes and prejudices towards marijuana and the racial stereotypes prevalent during the 1950s. The film portrays the 1950s as a period of social and cultural conservatism, and the reference to "reefer addicts" serves as a way to depict the era's mindset regarding drugs and certain racial groups. It's essential to remember that the movie is a work of fiction and is using this context to provide a backdrop for its story, rather than endorsing or promoting any particular viewpoint.