Mastodon 101: A "Subtoot" is a toot written by someone currently travelling in a subway. They are usually used to praise the effects of good public transit infrastructure.

𝘛𝘩𝘦 𝘮𝘰𝘳𝘦 𝘺𝘰𝘶 𝘬𝘯𝘰𝘸

@elomatreb Unless they're subtooting in NYC, in which case it's usually to complain about terrible public transit infrastructure.
@sanspoint Any subway system is better than no subway system, coming from someone living in a village with exactly 3 buses per day
@elomatreb Perhaps. Then again, I've literally had days where it would have been as fast to walk to work as it was to take the subway. Well, usually those days involve switching from the subway to a cab.