A Sumner is a fake bitch that uses her sexuality to attract desperate men despite being unattractive. She has lots of friends but none of them really like her, as well as a string of boyfriends who use her to get girls they really like. Summers have a terrible sense of style but have an overly confident exterior and crave attention. They insult others to mask insecurities they may have, and fish for compliments often. They are often two-faced and will do anything to get people to like them. Sumners are often plain looking with a few extremely obvious unattractive qualities, including their personality.
Boy 1: I just started dating Sumner, I'm definitely gonna get some soon
Boy 2: You're nasty, even you could do better than that