a man that, despite his lack of attractiveness, continues to act like a clown; a man that is ugly but behaves as if he is a Greek god
Love Island’s Wes is affected by ugly man syndrome. He mistreated Laura despite her being so kind to him.
by December 8, 2020
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Addition to the entries above:

A sudden awakening from UDS can have extreme big head reactions. This unfortunate turn of events is one of the primary foundations of the camwhore , a girl who has been sheltered/shunned from sex - but suddenly realizes she "has it".
UDS + TLC + netmeeting.exe = camwhore
by SaussyBurbank April 7, 2004
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When a person with a good personality is actually attractive.
When you set me up on that blind date, you should have told me she had the Ugly Duckling Syndrome, you scared me when you told me she had a good personality.
by Hyland February 2, 2004
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When you've been deprived of social interaction and/or sexual contact with fit girls, thus ugly girls around you appear to become hotter due to your pent up sexual frustration.
Boy 1 - "Argh i'm so horny, i've been at this god forsaken camp for over 2 weeks now and I still haven't got any, I think i'm gonna make a move for Gretchen."

Boy 2 - "Jesus Christ mate, you have seen what she looks like right? You're suffering from major Ugly Girl Syndrome, you'd better go have a wank and then think about your UGS."
by UGSSSSSS September 5, 2010
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It's like Ugly Duckling Syndrome but you start out pretty and when you grow up, you turn ugly.
Wow, she is flawed AND mean. She must have a case of Ugly Swan Syndrome.
by WhoDatFreshBoi March 5, 2017
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Ugly Bird Syndrome is the name given to the phenomenon of unattractive females making an extra effort to have a pleasant personality because they have little chance of securing a mate using their looks.

The phrase has also been used by motoring broadcaster and journalist Jeremy Clarkson, in his description of a car which is unappealing visually, but pleasurable to drive.
- Mate, why do you keep hanging out with such a minger?
- She's got ugly bird syndrome; last week she baked me a cake!
by ugly bird November 9, 2010
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