It's not necessarily beyond use. The connection - imagine a thin metal cup - has become loose, leading to heat and possibly arcing. Using a small flat head screwdriver, dig into the plastic around the circumference of each contact, and attempt to squeeze or crush the metal 'cup' - though only slightly. Be careful not to completely collapse it. That reduction of the inner diameter will cause the female connector to bite into the male connector and make good electrical contact. When you're done, it should offer resistance when inserting the male connection.
Speaking of, how does the male side look? Is it equally as toasted?
I should also mention that there is no guarantee of success, because the copper connector has likely become fatigued and will never be the same (from a metallurgical point of view) but that's the same reason why you should give it a shot. Can't really make it any worse.