the.com/vomiting
Your stomach's hostile takeover of the mouth, delivered with zero notice and full commitment.
means The forceful ejection of stomach contents back up through the mouth, usually triggered by illness, toxins, or motion.
from From Latin vomere, to discharge, which also coughed up volcano — both things that erupt without asking permission.
Brain bossA medulla cluster called the vomiting center triggers it.
Reverse gearThe stomach doesn't squeeze; abdominal muscles do the pushing.
Protective designEvolved to expel swallowed poisons before they're absorbed.