"A doodle is an unfocused drawing made while a person's attention is otherwise occupied. Doodles are simple drawings that can have concrete representational meaning or may just be abstract shapes."
I remember drawing one of our nationalist heroes Rentap in my Form 3 History text book, and that book got into my junior's hand. She told me it was entertaining and helped her at it.
So, go ahead and draw in the margins. It's helping you get the most out of that boring meeting — science says so!