The reverse of buck teeth. Instead of having jagged teeth pointing outwards the mouth, a person with China Mouth looks like they got a crowbar to the face.
A prevalent problem in mainland China, where many there can't seem to afford dental care. One of the (many) diseases of the people, such as herpes.
That chick at the skating rink looked hot until she opened her mouth. Not only did she have China mouth, but a tooth was missing too!
The Shanghainese girl had a nice face and body, but a horrible case of China Mouth.
Man, that chick is fugly. Not only is she fat, but she's suffering from China Mouth!