Extra Crispy is a slur used to describe Blacks in a derogatory way. A southern exspression that represents their burnt appearence, as well as their stereotypical love of fried chicken.
The word Extra Crispy 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 Extra Crispy, it is best to err on the side of caution and avoid using it in any situation.