To Sputter

1. (intransitive) To emit saliva or spit from the mouth in small, scattered portions, as in rapid speaking.
2. (transitive, intransitive) To speak so rapidly as to emit saliva; to utter words hastily and indistinctly, with a spluttering sound, as in rage.
3. (transitive, intransitive) To throw out anything, as little jets of steam, with a noise like that made by one sputtering.
4. (physics, intransitive) To cause surface atoms or electrons of a solid to be ejected by bombarding it with heavy atoms or ions.
5. (physics, transitive) To coat the surface of an object by sputtering.