The Collaborative International Dictionary of English v.0.48:

Slidder \Slid"der\, Slidderly \Slid"der*ly\, Sliddery
\Slid"der*y\, a. [AS. slidor. See Slide, v. t.]
   Slippery. [Obs.]
   [1913 Webster]

         To a drunk man the way is slidder.       --Chaucer.
   [1913 Webster]