You're referring to "Punishment Nyan-Nyan"!
There are references to APK files or mobile "story games" that use this keyword as a title for specific intense edits or game modules. Summary of Usage Punishment-NyanNyan-s
The specific universe
There have been documented cases (via Reddit’s r/HobbyDrama) where escalated. A "Light" cat scratch punishment turned into a "Heavy" one when the punisher got addicted to the power. Eventually, the punished user was ordered to send photos of themselves wearing makeshift cat ears in public—a non-consensual public humiliation act. You're referring to "Punishment Nyan-Nyan"