In a dry skillet, sear all sides of the roast until brown. Set roast aside.
In a bowl, combine the brown sugar, garlic powder, onion powder, oregano, bouillon, salt, and pepper. Use the mixture to coat all sides of the seared roast.
Place roast in a slow cooker and cover with any of the brown sugar/spice mixture.
Add the orange juice, lime juice, soy sauce, and cilantro to the bottom of the slow cooker.
Cook on low for 8-9 hours or 5-6 hours on high.
Remove roast and shred. Place shredded roast back in slow cooker to absorb cooking juices.
Serve meat in tacos, burritos, quesadillas, or enchiladas. Serves 6-8.