Jar Jar is a slur used to describe Blacks in a derogatory way. In Star Wars Episode 1, the computer-generated character Jar Jar Binks was filled with stereotypical black behavior. The actor who did the voice was also Black.
The word Jar Jar 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 Jar Jar, it is best to err on the side of caution and avoid using it in any situation.