An adult male with a bizarre obsession and hyper attraction for underage teen and preteen girls.
1: Where's Larry, I haven't seen him in a while?
2: Didn't you hear? He went down for being an Onision
1: Fuck, dude, that's messed up!
by Cliched Motherhopper December 27, 2016
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A very controversial and infamous YouTuber known best for his video "I'm a Banana". He has recently become the butt of ridicule as well as many hate videos aimed at deplatforming him. However, despite this he still has a loyal fanbase of around 2 million subscribers on his main channel.

While most people see him as a narcissistic delusional pedophile, his fans and regular non-obsessed haters see him as a disturbed person in need of psychological evaluation. His behavior can probably best be explained by his parents abusing him as a child and teenager, as well as him falling from the bow of a ship on his head when he was little.
"What YouTuber do you think is the most controversial?"
"Hmmm, I'd say Onision."
"He certainly has tea, doesn't he?"
by ShaneDawsonFan11211 March 28, 2019
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The most brutally honest and cut-throat YouTuber in existence. Also known as Greg Jackson, he doesn't give a shit about hate he receives and regularly makes fun of Emos, cutters, and basic bitches, but not limited to feminists and anorexics. If you don't want honesty, don't watch a guy named Onision.
Shane: "Omg guess what. I kissed Onision!"

Friend: "That insulting faggot who has strong opinions and roasts me with honesty in response to my retarded hatemail? Ew!"

Shane: "Yeah! He's great, isn't he?"
by Low-risk Hobbies December 23, 2015
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A youtuber that makes funny videos and speaks his mind. Has thousands of fans, and makes a living off of YouTube.
"What are you watching?"

"Onision."
by Mychemicalromace207 August 6, 2015
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I'm a GROOMER!
I'm a GROOMER!
I'm a GROOMER!
Look at me GROOM!
by bananacleaner March 22, 2023
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He poses as abhilarious, feminist comedian but don't be fooled! In reality he is a BANANA!!
Onision: I'm a banana, I'm a banana, I'm a banana , LOOK AT ME MOVE!!!!
by Alitaliali March 20, 2017
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