Primal Soup

A sexual act when one throws up into another's butthole and keeps it plugged for a few hours. Therefore, creating a questionable, biological stew in one's bowel or, a primal soup.

Dave: Hey, where's Stassi?
Chad: Oh man, last night we made some primal soup and now she's in the hospital!
Dave: Do you regret it?
Chad: Hell. No.