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1.
Orally emitted fecal vomit.
That girl's pussy was so nasty I retched heaps of festering copremesis all over her grandfathers hairless chest.
by Mike Scretion July 17, 2006
 
2.
The condition of being so constipated, one vomits ones own feces.

Usually considered to be a medical emergency.
Copremesis.

The severe cramps in Warrens abdomen turned out to be unrelated to his gym exertions, and more to do with his inability to shit for 3 weeks. It also went a long way to explaining his feculent breath.
by Dangeroux Dave May 24, 2006