What does it mean to call someone a muppet?

Calling someone a "muppet" typically implies that they are being foolish, naive, or inept, often in a humorous or lighthearted way. The term originates from the famous puppet characters created by Jim Henson, known for their silly and clumsy antics. It's often used in British slang to poke fun at someone's lack of common sense or to describe their behavior as silly. Overall, it carries a playful connotation rather than being purely derogatory.