Still is a slur used to describe Falkland islanders in a derogatory way. After British troops were forbidden to use the insulting term "Bennies", they named the Islanders "Stills" - because they were still Bennies.
The word Still is a racial slur that has been used historically to degrade and dehumanize falkland islanders. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to falkland islanders. If you are unsure about whether or not it is appropriate to use the word Still, it is best to err on the side of caution and avoid using it in any situation.