Let's open the Assosuini article. article provides good information about the tradition.
In the Italian tradition, the pig is a symbol of abundance and "grassa" (fatness/wealth). To eat pork at Christmas is to celebrate the success of the year's labor and to ensure prosperity for the year to come. Whether it is the slow-roasted arista of Tuscany, the rich ragùs of the south, or the spiced sausages of the north, the presence of the pig represents a refusal of scarcity. The "centoxcento" ethos—meaning one hundred percent—reflects this total utilization of the animal. In these traditional contexts, nothing is wasted; from the snout to the tail, every part is honored through specific regional recipes, creating a "patchwork" of flavors that define a family’s heritage. centoxcento 21 11 30 a natale si mangia maiale patched
Internet sleuths have traced the earliest known appearance of the full phrase to a now-deleted Reddit thread in r/italygaming from late 2024. The original post was a screenshot of a debug console from an unnamed horror game. The console output read: Let's open the Assosuini article