Can be used for anything. One can use the word to express himself, or refer to anything. The word finds its origins in the Netherlands. There, the founders of the word even have their own unofficial "company". They use it to label any of their projects. The word was used more often when people heard about it, and the founders were recognised as "those from Bolheid". For a more clear definition of the word as it can be used, please refer to the examples.