`fscheck (berkley)` made sense for me, as does "an u where the s in, now": `fuck`.
Or better: unfuck, would be a good program name, since someting is fucked up, we let's try to repair it?
I of course started referring to it as “Done Fucked Up” mode; I somehow suspect I wasn’t the first to do so.
It is open source, peggs the CPU at 100% on startup for about a minute, doubles game launch time, references 10 research papers, sometimes corrupts the world, and is so abstract only the author knows how it works - all to upgrade game worlds to new versions.
It is often called Data Fucker Upper.