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When something that is really bad is disguised as something pretty/handsome/beautiful.

First reference was made in a Season 2 episode of HBO's "True Blood" when Tara's intuitive cousin, Lafayette, referred to her mysterious then-lover, Eggs, as "Satan in a beautiful Sunday hat"
To victims of Ted Bundy would now probably refer to him as Satan in a Sunday Hat despite the fact that he had the eyes of crazed sonofabitch.
by maddywoo January 07, 2010
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