Adjective for saying that certain distance below ground level is suitable for subways or other underground transport. This word is commonly used by those who don't have a basic understanding of the English language.
"How far down do you reckon this subway station should go?"
"Um, well, it needs to deep enough that we can actually run some sufficient, kind of, subways under there"
In Toronto, Canada, it is by far the softest subway station in a city that is not quite soft. Usually crime and other mischevious activites go down at subway stations, however Chester station is in a soft neighborhood, so nothing ever goes down. It is between Withrow and Riverdale Park, hence its softness. Black people are rarely seen here.
Peter "I saw this nigga get smoked at the subway yesterday"
You "Nothing ever goes down when i use the subway"
Peter "what staion you use?"
You "Chester Subway Station"
Peter "Soft"