“香蕉” has yellow peel and white pulp, hence "香蕉人“ is used to describe some ethnic CHINESE peopl who live overseas and therefore have the western lifestyle and values, because they also have "yellow skin" and "white heart( like white people)". This term is used sarcastically so as not to be used in this way: 我是一个香蕉人。

i never heared about this,where are you found it?

I was confused till I read the comments because I had never heard anyone say this in Chinese. In the US, we, the Asian Americans, are at times called "bananas". It could be used as a pejorative term or as a non-pejorative term. We do tease each other (Asians) with terms like that, such as whitewashed, banana, fob, etc. But I suggest you avoid using any of those slurs unless you are talking to a really close friend.

查了一下这个词，不过在我这个地方好像平时不会说到这个词。如果是要说华人，可能会更加常用ABC。

我觉得不会不好。就如你说我是超人，闪电侠，蜘蛛侠一样