Piney is a slur used to describe Whites in a derogatory way. Women who use the pine tree shaped car fresheners as perfume to remove a multitude of smells inherent to the white trash lifestyle.
The word Piney 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 Piney, it is best to err on the side of caution and avoid using it in any situation.