Top Definition
The moment you are left awestruck as a BAMF/knight in shining armor turns out to of been that nobody, clumsy fumbling geek you once knew.
Neville Longbottom
Before(Book 1): Clumsy, forgetful, few to no close friends, toad for a pet

After(book 7):
1. He killed Nagini, Voldemort's snake, with the Gryffindor sword, whilst his head ablaze.
2. Stood up to Voldemort, saying boldly he wouldn't join them until 'Hell freezes over'.
3. He kept recruiting Dumbledore's Army even after Harry, Ron and Hermione had left.

I just saw 'Hiccup' in How to Train Your Dragon 2... Longbottomed again!
by etilauqa July 18, 2013

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Polar opposite of flanderization. When a shallow, bumbling, pathetic, and/or annoying character in a story evolves into a deep, capable (if not extraordinary) hero.
Longbottomed originates from the character Neville Longbottom (from the Harry Potter series), who started in book one as a clumsy comic relief who fell off his broomstick, and evolved throughout the series in terms of character development and competence into a vengeful white knight who slew Voldemort's living snake Horcrux while on fire.
by TheAllKnowingOne February 27, 2014

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When a person goes from being a weak nerdy or unattractive person and then suddenly becomes remarkably attractive.
Can also describe someone becoming very badass.
"Hey did you see the trailer for How to train your dragon 2?"
"Nah i havn't why?"
"Hiccup totally gets Longbottomed!"
by NZcountryboy July 21, 2013

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v.) an unpopular, bumbling, pathetic person who underwent an extreme personality change, becomes physically attractive, and (sometimes) a BAMF

Derived from the character Neville Longbottom in the Harry Potter series.
A: Is that Mike?!
B: Yeah it's him.
A: OMG really? How did he—
B: He got longbottomed.
by bottomsupniqqa August 02, 2013

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Someone who has successfully navigated puberty like Neville Longbottom in the Harry Potter films.
Daniel Radcliffe: Wow, you've really longbottomed

Matthew Lewis: Yea, I'm really glad I lost the baby fat and can pick up chicks now.
by HollyNoGoLightly January 13, 2016

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