To be an “Onie” means that you are part of a group that is only for men. This is because it has something to do with their no no square. People who are an “Onie” have a penis size under half an inch.
I had tried to have sex with this one guy last night, but he told me he was an Onie so I left ASAP
by Jadoni October 17, 2018
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Guy1 (in the 26th century) you hear about the illuminati

Guy2 you mean ONI
by Succ My Wiggly Dick March 20, 2018
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A word in some Japanesse animes "specificaly used by lolies" for "big brother"
"Big brother"(oni chan) Can you tuck me into bed"?
Big brother (oni chan) Can you help me out of the dryer"?
by Miku kinnie September 8, 2020
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Ao Oni (青鬼) is a Japanese survival horror game in which the player must solve puzzles and explore while avoiding The Oni.
Ao Oni translates to Blue Demon. Story: 3 boys and 1 girl enter a mansion which is rumored to have a monster in it.

Hiroshi, the protagonist, denies monsters existing and exclaims that it is "scientifically impossible". Hiroshi goes to explore a sound and finds out that it was just a plate shattered on the ground. Hiroshi returns to the room to see his friends missing. He sets out exploring to find them.
Ao Oni is totally rad man, it scared me for days!
by Ryouu December 16, 2012
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The type of fan who's intrested in only ONE character (usually because they find them attractive) and hate the rest of the characters in the same work/franchise.
-Hey, who's your favorite character in this game? John? Thomas? Alice?
-Idgaf about neither of them, I'm only here for Nolan, he's like the only person I actually enjoy watching
-Ah, so you're oni-fan then
by STVJet December 24, 2021
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Ony the Greatest is a person who lives in white middle class suburbs, who probably hasn't been diagnosed with a light syndrome of down's syndrome yet.. He is also a wannabe rap superstar! The song's he makes sound like they were written up while eating at a local Chipotle and then later on finished while taking a massive crap.
Guy 1
-Hey man have you heard Ony the Greatest's cover of Heartless?
Guy 2
-Yeah man.. It sounded like the shit I took this morning.
by #1ONYFAN January 21, 2013
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A word typicaly used in Japanesse animes by younger female anime girls to their older brother or just by anoying weeaboos who think they know the whole damn language.
"Oni Chan (big brother) can you make me a glass of milk?"
"Oni Chan (big brother) can I watch TV with you"
by Miku kinnie September 8, 2020
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