(in indonesia) a person who is not indonesian, especially a white person. At its core, the term bule is an indonesian slang word used to refer to people of caucasian or western descent See examples of bule used in a sentence.
Cantik banget bunganya😍 | By Bule Barbie | Facebook
The key takeaway here is that bule generally points to someone who is clearly not local, usually distinguished by their appearance, such as lighter skin or different hair color.
Some indonesians with lighter skin tones are even jokingly called “bule” by their friends
This shows that the term is more about being “different” from the majority than just skin colour.