The Collaborative International Dictionary of English v.0.48:

Slush \Slush\ (sl[u^]sh), n. [Cf. Sw. slaska to paddle in water,
   slask wet, filth.] [Written also slosh.]
   1. Soft mud.
      [1913 Webster]

   2. A mixture of snow and water; half-melted snow.
      [1913 Webster]

   3. A soft mixture of grease and other materials, used for
      lubrication.
      [1913 Webster]

   4. The refuse grease and fat collected in cooking, especially
      on shipboard.
      [1913 Webster]

   5. (Mach.) A mixture of white lead and lime, with which the
      bright parts of machines, such as the connecting rods of
      steamboats, are painted to be preserved from oxidation.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Slush \Slush\ (sl[u^]sh), v. t. [imp. & p. p. Slushed; p. pr.
   & vb. n. Slushing.]
   1. To smear with slush or grease; as, to slush a mast.
      [1913 Webster]

   2. To paint with a mixture of white lead and lime.
      [1913 Webster]

WordNet (r) 3.0 (2006):

slush
    n 1: partially melted snow
    v 1: make a splashing sound; "water was splashing on the floor"
         [syn: splash, splosh, slosh, slush]
    2: spill or splash copiously or clumsily; "slosh paint all over
       the walls" [syn: slosh, slush, slosh around, slush
       around]

Moby Thesaurus II by Grady Ward, 1.0:

116 Moby Thesaurus words for "slush":
   avalanche, bathos, big mouth, bleeding heart, blizzard, candor,
   clay, cloyingness, communicativeness, conversableness, crystal,
   driven snow, effusion, effusiveness, flake, flow of words,
   flowing tongue, fluency, fluent tongue, flurry, flux de bouche,
   flux de paroles, flux of words, frankness, garrulity,
   garrulousness, gassiness, gift of gab, glibness, glop, goo,
   granular snow, gregariousness, gumbo, gunk, gush, gushiness,
   hearts-and-flowers, igloo, long-windedness, loose tongue,
   loquaciousness, loquacity, mantle of snow, maudlinness,
   mawkishness, mire, mogul, muck, mud, mush, mushiness, namby-pamby,
   namby-pambyism, namby-pambyness, nostalgia, nostomania, ooze,
   openness, oversentimentalism, oversentimentality, prolixity,
   romanticism, scum, sentiment, sentimentalism, sentimentality, slab,
   slime, slip, slob, slop, sloppiness, slosh, sludge, snow,
   snow banner, snow bed, snow blanket, snow blast, snow fence,
   snow flurry, snow roller, snow slush, snow squall, snow wreath,
   snow-crystal, snowball, snowbank, snowbridge, snowcap, snowdrift,
   snowfall, snowfield, snowflake, snowland, snowman, snowscape,
   snowshed, snowslide, snowslip, snowstorm, soap opera, sob story,
   sociability, spate of words, splosh, squash, sweetness and light,
   swill, talkativeness, tearjerker, verbosity, volubility, wet snow,
   windiness