To spatter or splash something, or to speak in a confused, stammering way.
From 'be-' (prefix) + 'sputter' (to spit out words or liquid in a scattered way). The prefix adds intensity to the sputtering action.
The double meaning—besputter can mean violent splattering or nervous talking—shows how onomatopoetic words ('sputter') naturally extend to different actions that share the same chaotic, scattered quality.
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