We need to apply some linguistic analysis here. If Boxing Day is the day after Christmas, then clearly a boxing glove is a day after glove. Allowing for the inevitable loss of punctuation in the oral tradition, this must be the notorious day-after glove, an ineffective precursor to the morning-after pill. That would seem to be a sensible thing to be taking on a visit to one's love, in the days before its ineffectiveness had been conclusively demonstrated.