Curb-Biter is a slur used to describe Blacks in a derogatory way. Having someone bite the curb and kicking him in the back of the head is a painful way to kill someone. Often, as in the movie American History X, it is used as punishment for insubordinate blacks.
The word Curb-Biter is a racial slur that has been used historically to degrade and dehumanize blacks. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to blacks. If you are unsure about whether or not it is appropriate to use the word Curb-Biter, it is best to err on the side of caution and avoid using it in any situation.