Specialized vocabulary or language used by people in a particular profession, hobby, or social group.
Possibly from Portuguese 'língua' (language) via Spanish, or from Latin 'lingua.' Entered English in the 1600s from colonial trader jargon, originally meaning 'any foreign language.'
Every group develops lingo within days—hackers, doctors, gamers, skaters—because specialized words aren't just shortcuts; they're identity markers that exclude outsiders and bond insiders together.
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