Maldito Bori is a slur used to describe Puerto ricans in a derogatory way. Puerto Ricans come from Boriquen and call themselves Boriquas. Bori is short for that. Maldito is used so commonly before Bori by many other Hispanics because they steal, rob, kill, and smell. Maldito means "god-damned".
The word Maldito Bori is a racial slur that has been used historically to degrade and dehumanize puerto ricans. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to puerto ricans. If you are unsure about whether or not it is appropriate to use the word Maldito Bori, it is best to err on the side of caution and avoid using it in any situation.