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(n): A long limbed teenage or adolescent male; looks a bit stretched out.
Did you see Jeremy's growth spurt over the summer? What a longboi!
longboi by Hewlie1 October 25, 2017
"IVE DONE A LONGBOI!"
Longboi by weghfvbafvnserfgh April 20, 2018
A legendary cryptocurrency meme coin, launched in May 2023 to commemorate Longboi the duck. The Longboi coin, with the ticket symbol of “$LONGBOI” features a digital sketch of Longboi on a gold coin as its logo.
Longboi to the moon!
Longboi by Longboiyork May 28, 2023

Long Boi 

A very, very long duck who lives at the University of York. He went viral across the internet in April 2020.
Long Boi by Long Boi York April 29, 2021

Neville Longbottomed 

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."
1: A square who hangs around the streets in the early morning.

2: A clumsy or foolish person.
1: "Did you see that guy? What a longboon!"

2: "Why didn't you ask someone for directions you longboon!"
Longboon by Breeze3ze August 2, 2011