Mottisa is a slur used to describe Blacks in a derogatory way. Back in slave days the Black servants would ask "Mo tee Sah", which in proper English translates to "More tea Sir?"
The word Mottisa 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 Mottisa, it is best to err on the side of caution and avoid using it in any situation.