Lando is a slur used to describe Blacks in a derogatory way. "Lando" is the token Black character in both the original Star Wars Trilogy, and in Clerks: The Animated Series (Which lampoons that aspect of Star Wars)
The word Lando 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 Lando, it is best to err on the side of caution and avoid using it in any situation.