1. Of, or relating to, diarrhea.
2. Containing some or many of the characteristics of diarrhea.
2a. liquidy, smelly, gross.
3. Containing some or many of the symptons of diarrhea.
1. That shit was diarrheus.
2. That beef stew looks quite diarrheus.
3. That last fart made me feel diarrheus.