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A Twilight Boner is what happens when an obsessed Twilight fan boy or girl sees/hears/reads anything that has to do with the Twilight series.
"Today I saw the New Moon preview and totally got a Twilight Boner."

"I got the biggest Twilight Boner when I heard that the Twilight stars were going to be at the mall signing autographs!"
by Dumbwhiteperson July 02, 2009
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