GQ, in addition

This is what you get when you invite GQ to coloring time.  Coloring?  Not so much.  Throwing crayons all over the kitchen?  Yes, that sounds like a fine idea.

This is GQ saying:  "no."  He also like to say - over and over - "Bumby, bumby, bumby."  What does this mean?  I haven't a clue.  And if I keep asking him to do something despite the "no"?  He takes out his finger, points it at me, and makes a light saber noise.  As in, just you wait, I will get you with my light saber.