Pat dry pork with a paper towel.
Combine salt, pepper, oregano, cumin and chili powder in a small bowl. Then rub all over pork.
Place pork in the slow cooker. Cover the top of the pork with onion, garlic, and jalapeno. Pour orange juice and lime juice over the meat.
Cover and cook on low for 8-10 hours or high for 5-6 hours until the meat falls apart.
Remove pork onto a baking sheet and shred.
Place the baking under the broiler for 5 minutes or until the edges of the pork begin to crisp.
Ladle about 1/4 cup of the juices from the slow cooker evenly over the pork, and then give it a good toss with some tongs. Broil for an additional 5 minutes to get the meat more crispy. Then remove and ladle an additional 1/4 cup of broth over the crispy pork.