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1 definition by Matt Pelton

 
1.
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 01, 2007