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When people, usually female teens obsess over a mundane boy band.

Symptoms include:

-fainting upon sight of the jonas brothers.
-owning large amounts of jonas brothers merchandise.
-having a jonas brothers fansite as your homepage.
-being female.
-having jonas brothers posters over every single inch of wall in your bedroom.
-a lack of interest in anything other than the jonas brothers.
-making up sexual fantasies about the jonas brothers.
-ect. the list goes on.

Very similar to beatlemania