Is the phrase "A little more wiser" grammatically correct?

McTag: You heard it here first, folks: some people have things in their heads that their parents taught them.

Not "first" at all. Your memory is like a sieve, McTag, or more likely, it's your patent dishonesty once again leaping to the fore. We have discussed this before specifically in relation to may/can.

You have no focus because you are lost on the language issues.

On the contrary, your contribution to the "issues" here have been bizarre.

More lying from McTag.

My contribution was from the LGSWE. Yours was, as it typically is, from McTag's Book of Useless Opinions.

But feel free to keep parading your dishonesty.

I've reconsidered.

I've decided to opt for more wiserest.

So you did sleep your way thru English class. That's just as well, Lordy, look where it got McTag and Contrex - and Contrex got a B Lit!

No, it's not correct.
You should say a little wiser.