Makaronifresser is a slur used to describe Italians in a derogatory way. German. Fressen is impolite term for eating (people essen, but animals fressen).
The word Makaronifresser is a racial slur that has been used historically to degrade and dehumanize italians. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to italians. If you are unsure about whether or not it is appropriate to use the word Makaronifresser, it is best to err on the side of caution and avoid using it in any situation.