Buck/Buck Nigger is a slur used to describe Blacks in a derogatory way. This word has been used since the 17th century to refer to a male Negro - no matter whether slave or not.
The word Buck/Buck Nigger 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 Buck/Buck Nigger, it is best to err on the side of caution and avoid using it in any situation.