The phrase in question refers to sexually explicit or suggestive fan-created content featuring a character named Android 17 from the Dragon Ball franchise. This type of material falls under the umbrella of Rule 34, an internet adage stating that if something exists, there is pornography of it.
The prevalence of this type of content highlights the intersection of fandom, character popularity, and the accessibility of digital art creation and distribution. The specific focus on this character stems from their established presence in popular culture and the creative interpretations of their persona by individual artists and consumers of online content.