I can't be bothered googling, so I'm now assuming that today is called Boxing Day because stuffed turkey stuffed anglophone people celebrate it by going out on the streets and giving random passers-by the old one-two.
I can't be bothered Googling either, so I'm now assuming that the "old one-two" refers to a gentleman's one cock and two balls, and I can confirm that I will not be giving my "old one-two" to any random passers-by, as I am rather attached to them.
Smuel, if the old "one-two" is cock and balls, and it was boxing day, why would you need to part with your parts? Sounds like a holiday of getting one's one boxed.