<p>I think he means if there were very extenuating circumstances that led to a low gpa, like fatal illness, hiding out from a malevolent hitman or a really big family catastrophe. In that case there might be a chance at explanation, but then again there would still be a low gpa dragging you down.
Addition: That may work if there was a B in one semester, but very unlikely for two years of mediocre grades.</p>