Poke 3-5 holes in pork with sharp knife; stuff with half crushed garlic. Warm oil in large skillet over medium-high heat. Add pork & brown on all sides, 6-8 minutes.

Combine remaining ingredients in blender and blend 3-5 seconds until evenly combined. Place pork in slow cooker, pour liquid mixture over pork & let marinate about 10 minutes on each side.

Turn slow cooker on low; set timer for 8 hours. After 8 hours, remove pork & shred using two forks on large cutting board. Remove all liquid from slow cooker except 1 c. and add pork back to pot. Let cook another 15-30 minutes.

Serve shredded pork in lettuce wraps or in corn tortillas. Top with pico de gallo, chopped cilantro & avocado.