Real Dictionary

splutter
verb: If someone splutters, they make short sounds and have difficulty speaking clearly, for example because they are embarrassed or angry.

splutter in American English
a spluttering sound or utterance
to make hissing or spitting sounds, or to throw off particles in an explosive way, as something frying; sputter
to utter hurriedly and confusedly; sputter
intransitive verb: to talk rapidly and somewhat incoherently, as when confused, excited, or embarrassed
noun: spluttering utterance or talk; noise or fuss
transitive verb: to utter hastily and confusedly or incoherently; sputter

splutter in British English
noun: the process or noise of spluttering
verb: to spit out (saliva, food particles, etc) from the mouth in an explosive manner, as through choking or laughing