For those who're unfamiliar with the expression - glowing up or 'glo up' is when someone appears more attractive after they hit puberty. The oily face has cleared up, you've settled on a haircut that suits you, and you look and feel less gangly and awkward.
It's a great time, especially if you felt self conscious of your looks throughout school.
Caitlin Crowley recently shared her own #gloup moment to Twitter - but with her own take.
She shared a picture from few years ago, right before a freshman dance, with a boy called Dylan.
Her follow-up picture, taken more recently, features her girlfriend and best friend Kirrin Chew. The pair met at a college prep programme and have been dating for around a year.
They've only been fully out of the closet "for the past six months," Caitlin explained to BuzzFeed, and in that time they've experienced an "outpour of love" from everyone.
The tweet, which has since gone viral, was intended as a bit of an in-joke between friends. She's still friends with Dylan and they both enjoyed seeing how much they'd changed.
What happed next though, was wonderful. Women and men from all over started sharing their own 'glo up' moments with Caitlin. There was an overwhelmingly common message: "Relatable".
Every story in the gargantuan thread showed the process of coming out, of self-identifying and, most importantly, it showed a lot of love.
Caitlyn might not have been prepared for the all of the LGBTQI happiness that immediately poured into her time line - but it was certainly enjoyable to watch.
There were so many.
It was a shining example of people discovering their identity and feeling safe enough to be open about it.
Because that's something that not many people understand - every day for millions around the world there are times when you worry about being yourself.
But it's moments like these that dissipate some of that negativity.
Love is love.
And don't you ever forget it.
To quote RuPaul, 'can I get an amen up in here?'