p. 229
एवं ते वान्तमश्नन्ति स्ववीर्यस्योपभोजनात् ॥
In plain words
So this is what they end up eating: their own vomit — because they consume the very potency that was theirs.
Close to the Sanskrit
Thus they eat what has been vomited, from the consuming of their own potency.