Undecided questions
一级棒是什么意思？是方言吗？

http://zhidao.baidu.com/question/130426706

Copied and pasted your question into google. First link had it...Seems to be taken from Japanese "Ichiban".

不是方言， it means "the best" in a humorous way.

not a dialect,it's popular just because of an advertisement in my thought, something about children nutrition drink,i seldom heard people use it now,it's out of fashion
it meas your chinese is first class,but what's exactly meaning of the "first class",nobody knows

Means you say the Chinese very well.It is the compliment for you.

一级棒是Japanese“最好的”的意思。いちばん 一番 i tsi ban.
It means your chinese speak very well.

It comes from Japanese"Ichiban" and means that you are the best