Minger

Commonly known as the lowest level of ugly a human can be. The "Boss Level" of ugly.
Properly used in the past tense form.
Originating from the term "Mingle", used in some "dating" sites. The slang "Minger" is used to define the type of people that use it, in theory.

That chick I went out with was a real minger?
I bet they met on "....... Minger".com.