The act of aiming the poo exiting your anus to hit a specific target. For instance a spider, an pre-dropped depth-charge or the side in extreme cases. For example:
I went for a shit and a spider was trying to escape. Needless to say i used yesterdays lunch as mortar rounds using poo placement
As we all know, its common courtesy to not leave skidmarks on the side of the pan but in this case, I had to as it was the lesser of two evils - side-pan skidmarks or splashback. I was mid-poo and I knew the next one had a decent surface area. This meant that I had to use poo placement to make sure that it just scraped the side enough to cause minimal splashback.