Its how wide your dick is vertically (bottom to top, or top to bottom), if your boner is sticking staight out. Not that hard to imagine.
Frankly, with all this, I don't care. Too much of this and I'll become too judgemental on my dick. Screw that. I'm not that obsessed with my donkey, nor do I want to be. Too much thought and I'll just start to become paranoid about myself.
IDK. I think I'm kinda in a mood right now, b/c I have a lot of work to do, but again I don't think I would take Penis Enlargement that far, but in a way its not that far, but in a way its obsessive. I dunno...