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I put a dent almost exactly like that in my girlfriend's mbp by dropping my SLR on it when i was disconnecting it. I think she dealt with it well, a lot better than i would, i can't handle imperfections at all... i carry my mbp around with one hand as well, certainly no dents, but i think i won't do that anymore - heaven forbid i dent my own mac...
 
It took you a couple of weeks to see that dent???? You should be able to both feel and see that crater without light at a different angle than normal. It looks like something was dropped on it IMO.

Someone dropped something on your laptop while you were away?
 
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