What does "demi-guy" mean here?

Native speaker’s answer
Rebecca
"Demi-guy" here is a play on words. The actual phrase is "demi-god", which refers to someone who is half human, half god. In this case, however, he changes "demi-god" to "demi-guy" for humor to refer to himself being a guy who is also a "demi-god". "Demi-guy" is not a general or common term.