A girl who, initially and on the surface, seems plain and ugly but as you get to know her is actually an interesting and good-looking one!
John: She's the ugly duckling!
Matt: The what?
John: The ugly duckling! There's more to her than meets the eye.
by duckyduck789 January 7, 2012
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This one becomes a goose, not a swan. Forever a mockery of reality.

This is a special definition for a humanities teacher who I call a counter-intuitive bastard who thinks she’s a fucking dictator. She’d pair well with Mr. UnClean. Together, they could rule Auschwitz in harmony and perfect duality. 🖕🏼❤️🖕🏼
“Shit. We have The Ugly Duckling for a teacher this year. Welp, Imma hang myself.”
by adopt a toblerone March 3, 2020
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When your rutty duck or ruddy duck has dried up and forms a hard shell of poop around your dick/balls.
Aw man. I like having a ruddy duck, but I forgot to wash it off last night, so I woke up with a ugly duckling this morning!
by Jimmy Berserkeah October 24, 2007
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Beautiful people who didn't get pretty until high school or later, and were nice because they were ugly. The niceness carries over through life.
She's got ugly ducking syndrome.
by andrea February 6, 2003
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(A.) When a person used to be a really ugly kid, but then later turned out to be really good-looking.
And usually, the total opposite can happen.
by Glittery Goddess July 29, 2004
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A situation in which a girl who used to be ugly before puberty becomes hot, but still, in her own mind, she thinks she is ugly.
Often referred to as U.D.S.
"Krista seriously can't take a compliment can she?"
"That's because she has Ugly Duckling Syndrome."
by Matt Pelton April 2, 2007
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