Thanks for your input! Someone already has answered the question some time ago, here on Tumblr. And I got few more vigorous messages over the night, which explanation of the word. I suppose the Treecko picture was featured somewhere recently.
As I’m answering this in public, for those who are wondering: I was confused about the word ‘GIMP’ (the short for GNU Image Manipulation Program, my main art software) being banned in in Colors! Gallery when typying the word from 3DS (as I paint on 3DS). The original post is located here - x
Again, thanks for the concern.