as of 2019, an unfunny, uncreative, musty, crusty, sad, cheating excuse for a gaming youtuber.
john: do you watch jacksepticeye?
connor: no, i don’t think he’s funny. i prefer supermega.
by SonicsToes June 30, 2019
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jacksepticeye is a loud person who likes to shout a lot and is a pussy because he don't like beer and he is Irish
jacksepticeye is pussy
by tindjam09 [ps4] May 16, 2019
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Probably the most energetic YouTuber on YouTube.
He plays a lot of new games, happy wheels and takes the time to thank everyone.
He is Irish and has over a 7.000.000 followers on YouTube.
He is also one of the nicest people i have ever met.
He is a total boss, to be exact; the boss of bossy bossnessess that bossness can boss.
Top 'o the mornin to ya laddies, my name's Jacksepticeye and welcome (back) to (insert game title)
by WezelDeStenheid December 27, 2016
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Jack ( a.k.a. Sean) McLoughlin is an Irish gamer who posts to YouTube. He is very loud and has a tendency to cuss. He recently hit 1.5 million subscribes. He refers to himself as "The Boss". He got his start in September of 2013, when the top YouTuber PewDiePie ( a.k.a. Felix Arvid Ulf Kjellberg) gave him a shoutout in a competition. He became famous from playing Happy Wheels and Skate 3, as he still plays Happy Wheels if you'd like to watch it but dropped Skate 3 as he ran out of stuff to do. He currently doesn't have a name for his fans and addresses each person individually and not as one.
"Hey, you watch JackSepticEye?!"

"Yes! He is boss!
by paperwade November 17, 2014
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A very loud, amazing Youtube Gamer from Ireland. Friends with many other gaming youtubers, including Pewdiepie! He is a BOSS! He swears a lot, and makes lots of jokes, which are just a few things that make him funny. With over 5 million subscribers! Jack is catching up, Pewds!
JackSepticEye is a BOSS!
by FayeTho July 7, 2015
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