I think you are revisiting & teasing the idea of "illegible" and dividing it into obscure vs cryptic. Obscure means something the speaker is genuinely unsure about, and cryptic is a sure message meant only for a few. This reading of your mood is of course both.
I think of obscure as simply referentially obscure. Not being sure of what I'm saying is a whole other third variable. That mainly manifests as jokiness.