Cut the 2 lbs of pork into roughly 2 inch squares and place in the bottom of the slow cooker.
Pour the stick of melted butter in the slow cooker coating the meat. Do the same with the 2 Tbs of oil.
Break the one cinnamon stick in half and place to the sides of the meat.
Peel 5-6 garlic cloves, cutting the tips off, and break 3-4 bay leaves in half. Place the leaves and the garlic in the slow cooker, evenly distributed among the meat.
Add the 1 tsp oregano, 1 tsp kosher salt, 1 tsp black pepper, 2 tsp cumin, and 1 tsp (or more depending on taste) red pepper flakes, sprinkling evenly across the meat.
Pour the 1/3 cup whole milk in the cooker, being careful not to wash away the spices from the meat.
Add the Coca Cola, being careful not to wash away the spices from the meat. Add enough to just cover the top of the meat.
Turn the slow cooker to the Low heat setting. Cook for 6 hours, stirring every few hours.
Once cooked, remove meat from the slow cooker with a slotted spoon and place in a separate large bowl. Shred the meat using two forks, and add spoonfuls of liquid from the cooker to ensure meat is moist.
Serve on warm tortillas, with pico de gallo, sour cream, and chopped jalapenos.