Spray your slow cooker with nonstick spray. Set aside.
In a large bowl add brown sugar, syrup, rum, pineapple juice from both cans, and cherry juice from the jar. Mix til everything is combined well. Set aside.

In the slow cooker layer in this order: sliced ham, some pineapple, some cherries, and some of the glaze. Layer til all the fruit is used up. And top everything with rest of the glaze. Cover slow cooker and cook on High for 4-5 hours. Give a stir and once meat is heated through and absorbed some of the juices. Serve immediately and enjoy 😋.