FOTM (which can be an abbreviation for Flavor Of The Month or Fandom Of The Month) is a term used to describe an internet community that has a sudden boost in interest, but dies as quickly as it starts
This is a phenomenon in recent fandom where they will commonly fizzle out in the few months that its source material is out, this can be due to an influx of people deemed as toxic by others joining the community, or just people generally becoming uninterested
a term that has come up to describe the new trend of starting a new character to play the latest over powered class due to expansions or improvements to that class from the latest patches (or Savages in short).