Just because you don’t get it doesn’t mean it’s vague

“What about slang words and acronyms, aren’t they vague language?” Someone asked me this recently, and I wanted to say no right away, but I had to think about why. After thinking on it, I say no, slang words and acronyms are not vague language because they do not have inherently vague meanings; if anything, they are very specific. Vague words have inherently vague meanings– vague language is language you know, but can never be sure of. Take the word noonish– we know it means sometime around noon; we just don’t know exactly when. We also don’t know how late someone might be when they say they’ll meet you at noonish: 12:05? 12:10? What about quarter past– is that noonish anymore, or just plain late? I don’t think a dictionary, slang or otherwise, will ever tie noonish down to the hands of a clock. When people talk with each other in front of you in a language you don’t understand, they’re being cryptic, not vague. Or maybe you’re just being paranoid.