Ugly, usually meaty, girl that keeps guys away from her mostly better looking female friends. Reason for this behavior is mostly jealousy.
When a guy goes out with a female friend, she keeps away the girls.
Guys' night out. The guys see a group of girls, 5 hot 1 ugly (e.g.), the one ugly girl either claims the guys or just keeps her good looking friends away from them. The girl that has this behavior is called a waakvarken