Rufmord is the German word for defamation, literally an attack on someone's reputation through false statements. Online the clip is used far less seriously, as a shorthand accusation when a joke, rumour or edited screenshot makes someone look bad. Its popularity comes from how formal and heavy the term sounds compared with the minor social media drama it usually describes. Short spoken German phrases travel well as reaction sounds because the tone is clear even for listeners who do not speak the language, so the clip keeps circulating in meme edits and soundboards.