I find
jargon that I don't know to be nonsense and confusing upon first contact, but not
meant to confuse or mislead. Like almost all of language, the purpose is to enable and ease communication, not hamper it - however, it is created within a small group and by default not readily understood by anyone outside that group. If confusing language is used or even created with the purpose of masking what is truly being said the correct moniker for that would be
slang. I'm not sure that there even is a word for the case when it is actually meant to mislead.