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When someone hits puberty or changes from looking like a little kid to look more adult like.
Over summer Timmy had a glow up.
Related Words
The act of showing a hydrocele (large testicle) with a flash light, to show the fluid inside.
Tom had a glow show for all of us last night with his left nut.
Glow Show by bigleftnut January 4, 2012
When a graphic designer overuses Photoshop effects (either in quantity or amount), resulting in a gross display of their amateur skills.
Did you see that business card that Stefan did?" "yeah, he totally did a glow job on it!
glow job by designguy444 March 16, 2011

Glow Blow 

Girls/girl applies vaseline with or without color to their lips then proceed to give blowjobs in a black light room causing the lips and dick of the blowee to glow. Glow Blow.
1: Dude, did you hear about that Glow Blow party last night?
2: Yeah dude I heard that shit was cash.
1: Yeah my dick was glowing like a fucking flourescent bulb.

glow blow party blowjob black light blacklight
Glow Blow by xdivulgex August 6, 2011

Glow worm 

A drunkard, an alcoholic(see also glow)
That glow worm needs help badly.
Glow worm by Light Joker August 27, 2004

Glow Worms 

My friend and I were at this all nighter thing where this place took us around and we did all sorts of cool stuff all night. We went to this one place and it was a big-ass farm, and we were playing like capture the bag or some gay shit like that. Weedy an I went into the woods and hid an shit, then we looked on the ground and there were little spots of greenish/yellowish light. I picked it up and it was sorta like a mini slug except it wasn't slimy. "Glow Worms!" She shouted. And I chucked it out into the woods and it was pretty sweet looking so we kept chuckin em all over the place. Cus there was an ass load of em and it was a hell of a time.
Glow Worms are kick ass fun when you throw them.
Glow Worms by Carol March 3, 2005