well stepdad, i dunno, it could mean BOXING day.
but i looked it up & printed out this dictionary reference 4 you okay.
1. box day
The first warm day after a cold spell. All of the hot boxes will be out in their sluttiest attire, walking around, or sunbathing. Most will be donating free anal blowjobs in celebration of the glorious day.
"I was walking down the street and this box set pulled me to the side on Box Day and domed me off like there was no tomorrow. Hooray for good weather!"