No, Boxing Day doesn't mean you put on a pair of gloves and go at it, LOL
According to Wikipedia there is no clear information on how and where it was started. I was once told it originated with the aristocrats, that on the day after Christmas, the well to do would re-gift things to the servants, etc. And in that spirit, we have a bag of things to drop off at Goodwill today.
Otherwise, I gotta say I feel a bit like Santa and am ready for a long winter's nap.