Wiktionary
n. sexually explicit media of a person distributed online without the consent of the pictured individual, typically by a former partner or hacker, and often with the intent to humiliate the subject and damage his/her reputation.
Wikipedia
Revenge porn (sometimes lengthened to revenge pornography) is the sexually explicit portrayal of one or more people distributed without their consent via any medium. The sexually explicit images or video may be made by a partner of an intimate relationship with the knowledge and consent of the subject, or it may be made without his or her knowledge. The possession of the material may be used by the partner to blackmail the subject into performing other sex acts, or to coerce him or her into continuing the relationship. In the wake of civil lawsuits and the increasing numbers of reported incidents, legislation has been passed in a number of countries and jurisdictions to outlaw the practice, though approaches have varied. The practice has also been described as a form of psychological abuse and domestic violence.
The term "revenge porn" generally refers to the uploading of this sexually explicit material to humiliate and intimidate the subject, who has broken off the relationship. The term is also often misused to describe non 'revenge' scenarios, including nonconsensual pornography distributed by hackers or by individuals seeking profit or notoriety. The images are usually accompanied by sufficient information to identify the pictured individual, typically names and locations, and can include links to social media profiles, home addresses and workplaces. Victims, whose images expose them to workplace discrimination, cyber-stalking or physical attack, can have their lives ruined as a result. Given the practice by some companies of searching for potential sources of bad publicity, many victims of revenge porn have lost their jobs and found themselves effectively unhirable.
Jurisdictions which have passed laws against revenge porn include Israel, Germany, the United Kingdom, thirty-four states of the United States, and the Australian state of Victoria.