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The sometimes slow, sometimes overnight, always surprising transformation of someone, usually a man, from decidedly unattractive to hot as hell a la Matthew Lewis, the actor who played Neville Longbottom in the Harry Potter film series.
β€œMan, Thomas really Longbottomed that summer after high school and now he’s totally fuxable.” β€œWhatever bitch, he’s actually too good for you now.”

β€œTaryn Manning really reverse-Longbottomed to Pennsatucky in Orange is the New Black.”

β€œMatthew Lewis, after the original Longbottoming, is now more attractive than all of his former castmates.”
by Punter Scheisse June 24, 2014
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