"#REHASH" is the ninth episode in the eighteenth season of the American animated television series South Park.
Randy Marsh learns of an upcoming benefit concert that will feature a roster of popular musicians, including his secret identity, Lorde.
Randy accidentally sets the Michael Jackson hologram free and then rubs his groin in an attempt to win the audience back, but this only further enrages them and later causes Shelley to tear down her Lorde poster.
The Jackson hologram boards a bus heading toward South Park, as he needs to "take care of some important business".
The producer responds that artists are merely exploited to generate revenue, and that a hologram of Lorde will appear on The Tonight Show Starring Jimmy Fallon, exposing her anus to create more publicity.
Meanwhile, Randy's producer conspires with Cartman to install him as the leader in an upcoming social media revolution involving holograms.
However, this didn't work either because Parker had written a lot of good material and now felt it needed to be a three-part story arc episode.
This is also where the title came from; things like Twitter, YouTube Let's Play, and the Internet in general, sometimes feel like places where all people do is "rehash each other's shit", an opinion that is shared by several characters in the episode.
[4] Max Nicholson from IGN gave the episode a 7.8 out of 10, stating "in terms of sheer meta-ness, this week's #Rehash was off the charts.