'Monsterdon' hashtag trends on Mastodon with little context given

A single Mastodon post uses the hashtag #Monsterdon, and the items say nothing more about what it refers to. The meaning of the trend is unclear from the collected material.

Timeline

1. 19 Oct, 00:00 UTCFirst appeared on Mastodon (mastodon.social)
2. 19 Oct, 01:31 UTCReached #1 on TrendHeat

Top sources

• #MonsterdonMastodon (mastodon.social)