A region of China close to the Jong province. Literally known as "middle-mountain". This region typically produces small-eyed, dark-skinned peoples. The men are usually very feminine and have small "packages". Although cute on the outside, the typical zhong san man is quite dumb and lazy on the inside.
"Hey I was making out with this super cute tall tann-ed skin Asian, and things got very heated, except when he took out his penis, it was the size of my thumb."
"Ewww, he must be zhong san"