Dib is a slur used to describe Israelis in a derogatory way. Dumb Israeli Bastard. Commonly used by American Jews to deride the Israeli culture.
The word Dib is a racial slur that has been used historically to degrade and dehumanize israelis. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to israelis. If you are unsure about whether or not it is appropriate to use the word Dib, it is best to err on the side of caution and avoid using it in any situation.