just my intuition, but it sounds like your salivary glands are overactive.
i can't say i have that problem myself, but if i do...very mildly. i know my dad does it often though. evolution probably did not favor those who left their bodily fluids everywhere after speaking...but then again, speaking in itrself is likely "unnatural" as well.
what speech sounds usually cause the spitting? plosives?
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