I’m OK. Intermittent health grumbles, sometimes I’m fine, fine, fine and sometimes I’m autoimmune all over. I’m going to go out into the HOT afternoon sunshine right now and turn over my compost pile! Whee!
You be cool.
You (pronoun of address) be (imperative verb of being) cool (at a comfortably mild temperature)
~or~
You (Pronoun subject) be (used, incorrectly, as the 2nd person present indicative) cool (oh, with an admirable serene personal style.)
And it doesn't avoid the ambiguity to say, "You be chillin'."
You an' all your chillen...