There's often a thin line between what constitutes slang, jargon or what some term "argot". Many people look at slang as a means of expressing solidarity within a group ("in-group" language) but what of the language that keeps outsiders out ("out-group" language)?
In this article, doctor's jargon is looked at. Have you suffered a UBI or got a GLM? Perhaps we could also think about the jargon used by teachers to mystify their students (AO3, lexeme, interrupted constructions?!) or that used by OFSTED to mystify teachers.