It’s because racist white people usually refer to blacks as ‘monkeys’. And these same people also have the belief that all blacks sit on their porches all day, not working and drinking 40’s of old english. Hence, porch monkey.
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Name : Jared31201, Gender : M, Sexual Orientation : Straight, Race : White/Caucasian, Age : 23, City : Buffalo, State : NY, Country : United States, Occupation : teacher, Education level : Over 4 Years of College, Social class : Middle class,