"Blackfella" and "whitefella" are words used to describe different groups of people. "Blackfella" is a word used by some Aboriginal and Torres Strait Islander people to describe themselves, while "whitefella" is a word used to describe non-Indigenous people, particularly those of European ancestry.
It's important to remember that these words can be personal and emotional for some people, and some may not use them at all or may prefer other terms. Using them can sometimes be seen as a way of acknowledging cultural differences and histories, while also recognizing the shared humanity of all people.