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."
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