The expression references a specific type of fan-created fighting game featuring characters and assets from the Dragon Ball franchise, built using the M.U.G.E.N. engine. These games are typically distributed online, often freely, and offer a customized experience due to the open nature of the engine. As an example, one might find a game containing characters from various Dragon Ball eras, non-canonical transformations, and stages not present in official releases.
The popularity of these games stems from several factors. The M.U.G.E.N. engine allows for near-limitless customization, enabling developers to create unique fighting game experiences tailored to specific preferences. This freedom attracts both creators and players seeking content beyond official releases. Furthermore, the readily available nature of these projects, coupled with the passionate Dragon Ball fanbase, fosters a thriving community dedicated to sharing and enjoying these games. These creations offer a nostalgic experience reminiscent of classic arcade-style fighting games, but with modern enhancements and expanded rosters.