In scatodynamics, the triple point of a feces is the temperature and pressure at which three phases (for example, gas, liquid, and solid) of shit coexist in thermodynamic equilibrium. This is the perfect storm of gastrointestinal problems.
Chris was riding in the car and wasn't sure if he had to fart, shit, or maybe have diarrhea. "I think I'm at the triple point!" he exclaimed.