This is a French acronym used by some mailing list members; it stands for “Exemple Complet Minimal”, or “Complete Minimal Example”. The term refers to test files that can reliably reproduce a bug with the minimal amount of code.
Insufficient sleep results in cognitive fatigue.
Insufficient hydration and sustenance results in physcial fatigue.
Insufficient physical strength and cardiovascular investment/exercise results in both.
Cognitive and physical fatigue seem to hamper the practice of meditation and generally contribute to having a “bad day”.