a term used, when stating something very simple or that needs very little explanation is still not understood. an act of explaining it with pictures and diagrams drawn with crayons like you would do when teaching a child.
person 1 no i don't want to go out, i can't afford it and i'll will want to get absolutely smashed and it's my mums birthday tomorrow..
Person 2 "so? why? what's the problem?
Person 1 "right hold on till i grab my crayons and explain this to you in a way you will understand"