Dry pork butt and rub garlic salt and pepper all over it. Put rub ingredients on pork butt and place in a slow cooker, with the fat side up.
Add minced garlic, onion, and jalapeno. Top with lime and orange juices.
Cook on HIGH for 6 hours or LOW for 9-10 hours.
Let cool for 20 minutes before shredding making sure to discard any big chunks of fat.