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A term created by Luna Lovegood , in a fanfiction . Flumpawumps accumulate in teenage boys and make them do silly things such as: trip over their words near girls, follow blond haired boys around in the halls, or in rare cases boys will start to wear robes with weird moving objects in them and have creepy twinkling eyes. The most common extraction is with the mouth. AKA, a blowjob
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