Stump/Tree Jumper is a slur used to describe Whites in a derogatory way. Rednecks use Stump Jumper or Tree Jumper against hillbillies lower than themselves, but they also use it to point out hillbillies that commit incest- jumping the family tree.
The word Stump/Tree Jumper 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 Stump/Tree Jumper, it is best to err on the side of caution and avoid using it in any situation.