Skip is a slur used to describe Australians in a derogatory way. White Australians specifically. From "Skippy the Bush Kangaroo."
The word Skip is a racial slur that has been used historically to degrade and dehumanize australians. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to australians. If you are unsure about whether or not it is appropriate to use the word Skip, it is best to err on the side of caution and avoid using it in any situation.