According to the US's Library of Congress, Pribumi means:
Literally, an indigene, or native. In the colonial era, the great majority of the population of the archipelago came to regard themselves as indigenous, in contrast to the nonindigenous Dutch and Chinese (and, to a degree, Arab) communities. After independence the distinction persisted, expressed as a dichotomy between elements that were pribumi and those that were not. The distinction has had significant implications for economic development policy.In daily life when one uses the term Pribumi, most of the time it refers only to those non Chinese decendent.
However, in Lampung people uses the term Pribumi when they talk about Lampungese, sometimes also about those who are from other native tribe of Sumatra, such as Ogan. It's understandable since around 60% out of its almost 7 million inhabitans are Javanese.