Is Wise-as a Slang?

Slang. informed; in the know: You're wise, so why not give us the low-down? ... Slang. to make wise or aware: I'll wise you, kid.

Is Wiser proper English?

Re: is this correct

I think the correct way to say it is: wiser because wise is a short adjective and not a long one, so we can not say more wise. In common speech, "more wise" is often said. A Google of "more wise" gives 216,000 hits. But as I said in my previous post "wiser" is the better choice.

What do you call someone who is wise?

A person of learning, especially one who is versed in literature or science. savant. scholar. intellectual. sage.