when someone becomes really attractive after they hit puberty AKA ugly duckling syndrome
guy 1 - bro you remember ashley from middle school?
guy 2 - yea man fugly bitch look like she got hit by a truck

guy 1- dude she is HOT as fuck now. grew massive tits outta nowhere!!
guy 2- wow i guess she did glo up
by chicken drugs & co March 18, 2015
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When a female mentally tells her self that she is worth it, beautiful, and shouldn't care about what anyone else thinks. When she grinds on her own, she has a special look to her now that she accepts her self.
Girl 1: You seem different, in a good way.
Girl 2: Yeah, I had a glo up over the summer.
by Makeup_Queen May 12, 2016
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when someone goes from being ugly to smokin hawt
person 1: do you remember what niki looked like back in grade school?

person 2: ew yeah why?
person 1: she had a major glo up...she is so hot now, like 11/10 would smash and shes got a nice ass
person 2: dayum, i would let her leave her toothbrush at my place
by givenyousome February 18, 2018
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The act of going from UGLY to ATTRACTIVE over a period of time
"Damn he had a glo-up"
"I know right!"
by handler007 February 22, 2017
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A glo up is when someone becomes confident, and believes in themselves, and they don't give a fuck about what anyone says about them. That's what makes them seem more beautiful.
S/he had a glo up because they believe in themselves and has become more attractive.
by fuckingbox March 22, 2017
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