Gai-jin is a slur used to describe Whites in a derogatory way. Japanese equivalent to "Goyim," refers to anyone not Japanese, but especially Westerners. Actually is a shortened version of "Gai-koku-jin" (literally "outside-country-person," the NICE way to say "foreigner.") "Gai-Ko," depending on how it's written in
The word Gai-jin is a racial slur that has been used historically to degrade and dehumanize whites. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to whites. If you are unsure about whether or not it is appropriate to use the word Gai-jin, it is best to err on the side of caution and avoid using it in any situation.