Argot

имя существительное [французский язык, лингвистика] арго; жаргон Синоним(ы): slang

Большой англо-русский словарь

Argot

noun Etymology: French an often more or less secret vocabulary and idiom peculiar to a particular group Example: shoved into a taxi by a porter whose argot I couldn't understand — Allen Tate

Merriam-Webster's Collegiate Dictionary