Someone that is extremely uneasy on the eyes. Where you puke a little in your mouth when you see them...
Also varibles of No chin mountain chicken
and snaggle tooth mountain chicken, in which also having similar definitions.
Tera: Have you seen Ed?
Teri: Ya why?
Tera: He's a real Mountain Chicken!
Teri: No, he's a Snaggled Tooth Mountain Chicken!
Tera: You got that right! He's ugly as hell!