Blue-Eyed Devil is a slur used to describe Whites in a derogatory way. Whites primarily with blue eyes are said to be the most evil. Especially since their skin is so pale, it looks scary to others as their blue eyes stare out at them.
The word Blue-Eyed Devil 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 Blue-Eyed Devil, it is best to err on the side of caution and avoid using it in any situation.