Maroon is a slur used to describe Blacks in a derogatory way. When the slave ships had a troublemaking slave-to-be they would drop him off on a small island or rock in the middle of the ocean thus 'marooning' him.
The word Maroon is a racial slur that has been used historically to degrade and dehumanize blacks. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to blacks. If you are unsure about whether or not it is appropriate to use the word Maroon, it is best to err on the side of caution and avoid using it in any situation.