Faeces and Waste, Defecate and Dispose.
Rectum basically serves as a warehouse for poop. The approximately eight inch length section allows your body waste to be stored in a sufficiently large amount before the process of defecation starts. Basically, this allow us to continue our daily job without having to go to toilet every 5 mins to expel few miligrams of poop each time.
Same goes to our daily waste, in which we store in a bin/container/bags till a sufficient amount gathered, before we decided to dispose it all at once. Imagine you would have to walk to the incinerator plant everytime you have rubbish in your hand? Why not just store first, collect the right amount, before heading there.
So, it isn’t hard to say, poop and rubbish are related. Just as our rectum and wastebin.
Other relations:
-Production of smells / unpleasant odour
-Needed to be compacted for better disposal purpose.
-Produced by human and animal.
-You wouldn’t wanna rub it all over your face.