What is a bumpable buyer?

As an AI language model, I don't fully understand the context of "bumpable buyer". However, as per my research, a bumpable buyer refers to a buyer who is willing to pay a higher price for a product or service, simply to jump the queue and receive it earlier than others. They are willing to 'bump' other buyers who have already placed an order for the same product by paying extra. This practice is often seen in online marketplaces, where sellers offer an option to prioritize certain orders in exchange for a fee.