An extreme form of scat. A bowel-movement mixed in with an up-chuck of sorts.
Hey! Did you see that 2girls1cup video? That was Grade-A sewer syrup!
I was digging this girl, and she seemed to want to put out. So, I went to her house, we got on the couch, and she shat in my face. However, after I puked back into her asshole, she came. I've had better sewer syrup in my days.