A Girl who grew up all her life unattractive until High School or College when she then "Blossomed" into a really hot girl. Unlike naturally pretty girls though, her self-esteem is pretty low (As it'll almost permanently be for life) but, she has a good heart, personality, and soul because that's all she could afford to have when she was unattractive. Also, any girl with UDS, will go out with any guy cause to her "Looks Doesn't Matter. As long as they have a good Sense of Humor." As long as they never realize that they're a Ten, they'll always be humbled and down to earth.
Ugly Duckling Syndrome definition by Urban Dictionary
