racial slur towards people with a darker skin color, not used as much nowadays but was used much more in the late 1800s and early 1900s. It is considered very oppressive when a person that's skin color is white calls a person who's skin color is darker.
(Martin) "Excuse me mister, can I please get a little gas so I can get back to town."
(Johnson) "No, you can't jigaboo now get going you're in the way of the pumps."