I would say feces. If I am remembering correctly, during a graduate course in pathogenic microbiology, it was stated that 1 gram of fecal matter has at least 10^9 bacterial cells (a billion). read more
It will be Feces, like, come to think of it , vomiting means the acid from your stomach goes up where no other bacteria like the ones in intestines that actually dont die in acid found in stomach, so yeah i guess feces , for geez sake. read more