A small man or a man with a small "Mc"penis.
Beau's penis was sooo small that he couldn't please a woman. He was said to have Mcminn, a rare disease. It originates from the "Mc" in McDonalds small sandwiches. And the "minn" use to be "man." Hence a small man.
ayon kay David Benemer ika-22 ng Agosto, 2006