Top definition
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.
Man, Thomas really Longbottomed that summer after high school and now he’s totally fuxable.” “Whatever bitch, he’s actually too good for you now.”

“Taryn Manning really reverse-Longbottomed to Pennsatucky in Orange is the New Black.”

“Matthew 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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