jargon

a characteristic language of a particular group (as among thieves)

Confused, unintelligible language; gibberish; hence, an artificial idiom or dialect; cant language; slang.

from Greek 'gargos' meaning 'garish, colorful'

“Sentiments we won't discuss; though you know that sentiments have a bearing on social life: are factors, as they say in their later jargon.”

— George Meredith, Complete Project Gutenberg Works of George Meredith

Emeka, a Montreal tech entrepreneur, dazzled his aunt with jargon like "cloud-based synergy" and "next-gen disruptors." But when she asked for a real-world example, he could only mumble about "internet of things," leaving her more confused than ever.

Catarina weaved through Cairo's Khan el-Khalili bazaar, her ears catching snippets of traders' haggling terms—secretive phrases only the initiated understood. A vendor caught her eye and called out a price in what she could only describe as jargon, sealing another deal with a swift handshake.

“Progressive Jargon Aphasia is a fluent or receptive aphasia in which the person's speech is incomprehensible, but appears to make sense to them.”