The Collaborative International Dictionary of English v.0.48:

Splutter \Splut"ter\ (spl[u^]t"t[~e]r), v. i. [imp. & p. p.
   Spluttered (-t[~e]rd); p. pr. & vb. n. Spluttering.]
   [Prov. E. splutter, eqivalent to sputter. Cf. Sputter.]
   To speak hastily and confusedly; to sputter. [Colloq.]
   --Carleton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Splutter \Splut"ter\, n.
   A confused noise, as of hasty speaking. [Colloq.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

splutter
    n 1: the noise of something spattering or sputtering
         explosively; "he heard a spatter of gunfire" [syn:
         spatter, spattering, splatter, splattering,
         sputter, splutter, sputtering]
    2: an utterance (of words) with spitting sounds (as in rage)
       [syn: sputter, splutter]
    v 1: utter with a spitting sound, as if in a rage [syn:
         sputter, splutter]
    2: spit up in an explosive manner [syn: splutter, sputter,
       spit out]