1) Something that is absolute shit. The worst imaginable thing you have ever seen. It is commonly used to insult someone when they tell a very terrible joke or do something that can only be describes as diarrhea poo.
2) Chronic Diarrhea that causes terrible pain to your ass when coming out. It is slurpy and wet.
1) Jimmy: Hey guys look at this drawing of my mother I spent all last night drawing! What do you think?
Chuck: I think your drawing is absolute diarrhea poo!
2) Jimmy: OMG I went into Chris's bathroom last night after the party to find the grossest fucking diarrhea poo in the toilet. I nearly barfed.