Mario is a slur used to describe Italians in a derogatory way. Famous Italian vidoegame plumber. Used to refer to fat Italians.
The word Mario 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 Mario, it is best to err on the side of caution and avoid using it in any situation.