The Collaborative International Dictionary of English v.0.48:

Bedash \Be*dash"\, v. t. [imp. & p. p. Bedashed (?); p. pr. &
   vb. n. Bedashing.]
   To wet by dashing or throwing water or other liquid upon; to
   bespatter. "Trees bedashed with rain." --Shak.
   [1913 Webster]