Wordnet 3.0
ADJECTIVE (1)
1. 
 causing or tending to cause things to slip or slide; 
- Example: "slippery sidewalks"- Example: "a slippery bar of soap"- Example: "the streets are still slippy from the rain"[syn: slippery, slippy]
The Collaborative International Dictionary of English v.0.48:
Slippy \Slip"py\, a. [AS. slipeg.]
   Slippery.
   [1913 Webster]
WordNet (r) 3.0 (2006):
slippy
    adj 1: causing or tending to cause things to slip or slide;
           "slippery sidewalks"; "a slippery bar of soap"; "the
           streets are still slippy from the rain" [syn: slippery,
           slippy] [ant: nonslippery]