theory of comparative girls
When a halfway-decent looking girl hangs out with a very unattractive girl in order to make herself look attractive.
"Did you see that picture with Emma last night? She looked so hot!"
"Nah, she's just using the theory of comparative girls to make herself look better by standing next to that fat chick."
"Nah, she's just using the theory of comparative girls to make herself look better by standing next to that fat chick."