The Collaborative International Dictionary of English v.0.48:

Spilth \Spilth\, n. [From Spill.]
   Anything spilt, or freely poured out; slop; effusion.
   [Archaic] "With drunken spilth of wine." --Shak.
   [1913 Webster]

         Choicest cates, and the flagon's best spilth. --R.
                                                  Browning.
   [1913 Webster]