Spice Rubber is a slur used to describe Indians in a derogatory way. Because they use massive spices in their cuisine and they rub them on their bodies.
The word Spice Rubber is a racial slur that has been used historically to degrade and dehumanize indians. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to indians. If you are unsure about whether or not it is appropriate to use the word Spice Rubber, it is best to err on the side of caution and avoid using it in any situation.