What is this brown goo?

So I'm laying on the couch this morning and Tyler wants up with me so I put him up there with me. He keeps clapping his hands and playing with something and I really couldn't tell what it was. I was so tired I could hardly keep my eyes open. But he kept clapping his hands so I opened my eyes and his hands were covered in brown goo. Yeah you might have thought it was playdough or something. I couldn't figure out what it was...then I smelled it..OH MY GOSH!!!! Talk about gross, and incredibly disgusting. It was POOP!! The kids was playing with POOP!
Completely disgusted and totally confused I took him to the bathroom. By this time I have it on me and its all over his hands and legs. Oh I'm so grossed out. So I strip him and wash his hands. All the while I'm trying to figure out who'
s poop it is. Did Addy poop in the house? No she never poops in the house and besides she was in the kitchen.
I had already changed a poopy diaper this morning it couldn't be his could it?
So I clean the poop off his hands. By this time Jeff is up and I'm telling him about the poop. He is so grossed out he doesn't even what to hear it. But I'm shocked and confused and disgusted all at the same time. I will solve this problem. I"ll figure it out.
So I took Tyler to his room laid him down on the changing table and opened the diaper and yes it was HIS POOP! My son was playing with his poop! Can it get any more disgusting?

I"m still confused why he would do something like this but his habit of sticking his hands down his pants like a man has GOT TO STOP!