The Collaborative International Dictionary of English v.0.48:

Bespatter \Be*spat"ter\, v. t. [imp. & p. p. Bespattered; p.
   pr. & vb. n. Bespattering.]
   1. To soil by spattering; to sprinkle, esp. with dirty water,
      mud, or anything which will leave foul spots or stains.
      [1913 Webster]

   2. To asperse with calumny or reproach.
      [1913 Webster]

            Whom never faction could bespatter.   --Swift.
      [1913 Webster]

WordNet (r) 3.0 (2006):

bespatter
    v 1: spot, splash, or soil; "The baby spattered the bib with
         food" [syn: spatter, bespatter]