Smoked Irish is a slur used to describe Blacks in a derogatory way. Irish, especially during the late 19th early 20th century, were thought of as no better than "niggers," and conversely, blacks were associated with them.
The word Smoked Irish 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 Smoked Irish, it is best to err on the side of caution and avoid using it in any situation.