The state of being slushy, which means something is wet and soft, like snow that is starting to melt.
Slushinesses can be messy and not very nice to walk in.
Examples:
The slushinesses on the ground made it hard to walk.
I don't like the slushinesses on my shoes.
The slushinesses from the snow made everything wet.
The slushinesses got all over my pants.
The slushinesses from the melted ice cream covered the table.
The slushinesses in the street made a big mess.