1) One who explodes vocally 
• (n.) One who sputters.
Sput'ter·er noun One who sputters. 
sputterer 1. Someone who has spit, or ejected, particles of saliva, food, etc., from the mouth in a light spray, as when speaking angrily or excitedly. 2. Anyone who has spit or squirted something from the mouth with explosive sounds.