counterlanguage means any form of language set up in opposition to another, such as slang or code. Lexicurio rates it Sui generis — a strength score of 85 out of 100.
Why “counterlanguage” is a great word
COUNTERLANGUAGE — [Noun] A deliberately oppositional form of language, such as slang or code, created or used in defiance of a dominant or mainstream language. From the English prefix counter- ("against, opposite") + language. Unlike "argot" (which primarily denotes the specialized, often secretive vocabulary of a trade or group) or "antilanguage" (a sociolinguistic term for a subculture's fully oppositional system), counterlanguage is the broader, applied craft of linguistic insubordination. It is the hissed warning in a prison yard that guards cannot parse, the sly inversion of a state slogan on a protest banner, and the private lexicon that transforms a slur into a defiant emblem—a quiet architecture of resistance built from the very words meant to suppress.
Etymology
From counter- + language.
noun
- Any form of language set up in opposition to another, such as slang or code.