The Collaborative International Dictionary of English v.0.48:

Taplash \Tap"lash`\, n.
   Bad small beer; also, the refuse or dregs of liquor. [Obs. or
   Prov. Eng.]
   [1913 Webster]

         The taplash of strong ale and wine.      --Taylor
                                                  (1630).
   [1913 Webster]