Top definition
Someone who is very immature and childish. They are grown up but act like a bunch of 5 year olds. A Hyunsoo does stupid things that embarrass people around him/her.
Dude seriously stop spitting water at random people! Are you a fricking hyunsoo?? You're not 5, cut it out.
by Jig_Master May 22, 2014
Happy St. Patties Day!
He’s “that” guy. The best.
That prodigy could be the next HyunSoo!
by Notwhoyourethinking January 17, 2018
Happy St. Patties Day!