Jacked Daniels.
Explanation: This joke is a clever pun that combines “Jack Daniels,” a well-known brand of whiskey, with the term “jacked,” which is slang for being muscular or fit. The punchline humorously suggests that an alcoholic bodybuilder is named “Jacked Daniels,” playing on the dual meanings of the words. The humor arises from the playful merging of fitness and alcohol, creating a lighthearted and witty punchline.