The Collaborative International Dictionary of English v.0.48:

Plashy \Plash"y\, a. [From 1st Plash.]
   1. Watery; abounding with puddles; splashy. "Plashy fens."
      --Milton. "The plashy earth." --Wordsworth.
      [1913 Webster]

   2. Specked, as if plashed with color. --Keats.
      [1913 Webster]