The term "hentai-dragon-ball" is referring to a specific type of adult animation, which combines elements from the popular Japanese anime and manga series "Dragon Ball" with hentai content. Hentai refers to explicit and often fantastical adult animated material that is primarily consumed by adult audiences in Japan and around the world. The tag suggests that the video features adult themes and graphic sexual content involving characters or scenarios from the Dragon Ball universe, which includes series such as "Dragon Ball," "Dragon Ball Z," "Dragon Ball Super," etc. This type of content is not officially endorsed by the creators of the original series but is created by independent artists and animators for an adult audience.