When a non-attractive person goes through puberty and becomes very attractive as a result.

First seen on Tumblr and Imgur, this term refers to Matthew Lewis's battle and victory over puberty.
"Have you seen Lisa since grade school?"
"No I have not, she really Neville Longbottomed. Damn."

"I was staying at my friend's house when her brother who I haven't seen in years walks in to say hello. I was in shock, as he Neville Longbottomed."
by Jamie McCrimmon August 22, 2013
Get a Neville Longbottomed mug for your fish Larisa.
(verb)- made to believe that a person or character is unattractive, and then to find out they are the hottest thing on two feet,

origin- English- after the character Neville Longbottom from the popular Harry Potter series by British author J.K. Rowling
That show Neville Longbottomed us in season two. The main character turned so hot!
by whatnow35 December 14, 2013
Get a Neville Longbottomed mug for your daughter-in-law Yasemin.
In the popular film franchise Harry Potter , Neville longbottom goes from being a slightly geeky , chubby child to a fit as fuck adult. Similar to a glo up, if someone has Neville longbottomed they have gotten significantly hotter
"Have you seen Tom recently? He's so hot now!"
"I know, he's seriously Neville Longbottomed!"
by Ginjasaaa May 30, 2017
Get a Neville Longbottomed mug for your fish Zora.
When a character, despite being intelligent, brave, talented, or an otherwise stalwart and loyal friend is dismissed by fans until they become more attractive, at which point everyone pays attention to how hot they became.

refers to Neville Lognbottom, a character from JK Rowling's Harry Potter series, who was generally unpopular until the actor portraying him (Matthew Lewis) became attractive in time for the film adaptations of the final book.
Jeff has many interests that nobody cared about before he Neville Longbottomed, they still don't care but at least he's attractive.

Mary Neville Longbottomed and now she can't tell who is her friend and who just wants to sleep with her.
by those guys you don't know September 16, 2013
Get a Neville Longbottomed mug for your cousin Georges.
To get significantly more attractive after going through the process of puberty.

Origin stems from Harry Potter, where the character Neville Longbottom (actor: Matthew Lewis) went from a dumpling shaped (but very sweet) 11 year-old to a daaaamn fine (and still very sweet) 25 year-old today.

The word was popularised by tumblr usage as both a noun and a verb.
Me looking in the mirror: I'd better Neville Longbottom by the time I get to uni, or I'm going to die alone. :/
Person returning home from uni: Is that...? Is that Susan?! Well she certainly Neville Longbottomed.
Person referring to their boyfriend: Nah, I'm not gonna break up with him. Yeah he's kinda pudgy, bit fingers crossed he'll do a Neville Longbottom!
by ICantThinkOfAUsername June 21, 2015
Get a Neville Longbottom mug for your father-in-law Günter.
BAMF.
Neville surprised us in the seventh Harry Potter by being such a badass. We now like to refer to him as BAMF. If he lets us.
Shall we review?

"Harry heard a scuffle and a shout, then another bang, a flash of light and a grunt of pain; he opened his eyes an infinitesimal ammount. Someone had broken free of the crowd and charged at Voldemort."
This badass would be Neville.

"The longer Harry looked at Neville, the worse he appeared: one of his eyes was swollen, yellow and purple, there were gouge marks on his face, and his general air of unkemptness suggested that he had been living rough. Nevertheless, his battered visage shone with happiness as he let go of Hermione and said again, 'I knew you'd come! Kept telling Seamus it was a matter of time!'
'Neville what happened to you?'
'What? this?' Neville dismissed his injuries with a shake of the head. 'This is nothing.'"

Finally the most BAMF moment of all:
"In one swift, fluid motion Neville broke free of the Body-Bind Curse upon him; the flaming Hat fell off him and he drew from its depths something silver, with a glittering, rubied handle-
The slash of the silver blade could not be heard over the roar of the oncoming crowd, or the sounds of the clashing giants, or of the stampeding centaurs, and yet it seemed to draw every eye. With a single stroke, Neville sliced off the great snake's head, which spun high into the air, gleaming in the light flooding from the Entrance Hall, and Voldemort's mouth was open in a scream of fury that nobody could hear, and the snakes body thudded to the ground at his feet-"
BAMF!
"If you're looking for Neville on the Marauder's map, he's labeled 'BAMF.'"

"Neville uses Nagini's blood as soy sauce."

"Neville Longbottom is what's beyond the veil."
by mathilde August 19, 2007
Get a neville longbottom mug for your fish Helena.
The best person in Harry Potter. He full on stands up to Lord Voldemort in the last one. And your just like HELL YEAH!
Puberty also made him hot.
Person 1: DAAAAYUUUM, WHO'S DAT?
Person 2: Oh that brave hottie is Neville Longbottom
by strawberiiya July 30, 2011
Get a Neville Longbottom mug for your papa Manafort.