Place butter in pan, heat on low in oven or smoker until the butter is melted. Remove from heat and add Worcestershire, hot sauce and liquid crab boil to butter. Place shrimp in pan and mix well with the butter sauce.
Mix all the dry ingredients and pour over the shrimp. Use gloved hands to toss the shrimp until they are well coated with the seasoning mix.
Preheat your Masterbuilt Electric Smoker to 225-230°F. Add apple or pecan (or a mix of both) chips to the wood chip loader and wait for the unit to start smoking. Smoke at 220-230 °F until shrimp turn opaque and curl up (around 45-60 minutes) It helps the flavor if you stir and flip the shrimp at around the 25 minute mark.
Spoon the shrimp into bowls and pour a little of the sauce on top. Serve with some good crusty french bread (to dip in the sauce) and a side Caesar salad.