If you are gullible why are you called a mug?

The term "mug" is slang that originated in British English, referring to someone who is easily deceived or tricked. It likely derives from the idea of being taken advantage of, akin to being a "soft touch." This association plays on the notion that a gullible person is as easy to fool as a mug might be to use, implying a lack of discernment or awareness. Essentially, it highlights the vulnerability of being overly trusting or naive.