Jish is a slur used to describe Jewish in a derogatory way. Slurred contraction of "Jewish"
The word Jish is a racial slur that has been used historically to degrade and dehumanize jewish. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to jewish. If you are unsure about whether or not it is appropriate to use the word Jish, it is best to err on the side of caution and avoid using it in any situation.