If the ham is frozen, allow it to thaw in the refrigerator before cooking.
Place the ham in a slow cooker with the rounded, fat covered side up.
Put the lid on the slow cooker and cook the ham on low for 6-8 hours. Moisture gathers on the top of the slow cooker and drips down on the ham, keeping it moist.
When the ham falling off the bone, you know it is done. Remove the ham, in sections, from the slow cooker and cut away the fat and well cooked edges.
Slice the ham and put it back into the ham juice in the slow cooker and turn it to warm until you are ready to serve. If there is a longer period of time before serving, give the ham a stir every once in while and baste the ham slices with the juice on the bottom