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An individual who speaks using precise acronyms, slang, and obscure words related to one or more specialized professions even when not talking to other individuals in the profession; someone who talks over others' heads subconsciously using specialized words.
Bones is such a jargonnaut --- she left the entire jury behind while describing that kid's skeleton.

I don't get invited to parties anymore because whenever I do, I turn into a total jargonnaut and look like an elitist asshole.
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Someone that delights in using far too many acronyms in front of people that work in different industries.
"Wow, did you catch anything that Simon said? Now he's a Jargonnaut!"
by Emily Crispian November 09, 2011
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