Ao Oni

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!

Ao Oni by Ryouu December 16, 2012

PARANOiA survivor MAX Oni 

Commonly known as PSMO. It is the single hardest song that has ever been seen in an arcade release of DanceDanceRevolution. This song makes its appearance in DDR Extreme, and is the Challenge steps to PARANOiA survivor MAX. The difficulty of this song is to the max in every category, save for perhaps Chaos (the song is relatively streamed). The day when a player achieves an A on this song is usually the pinnacle of his (or her) DDR career.

"It took me 2 years to beat PSMO, but I did it!"

PARANOiA survivor MAX Oni by GuyMonkey October 23, 2004

Neko-Oni 

A creature that lives within sub-dimentions. Able to traverse realities due to its demonic genes. These creatures have some religious tendencies and a social order that, though obsolete, still exists.

Usualy found to be about 6ft with a 16ft wing-span. Humanoid with feline features including fur, ears, nose and a tail.

A symbol known as the "Eye of the Oni" appears frequently within their culture

The Quick Neko-Oni Jumped Over The Lazy Dog

Neko-Oni by Matt Katt December 2, 2004

PSM Oni

Shortened term used to refer to a song from Dance Dance Revolution called PARANOiA Survivor MAX on Challenge/Oni mode. It has been argued to be the toughest DDR song in existance, running at up to 290 bpm with 617 arrows.

I can't believe he beat PSM Oni

PSM Oni by Angelic April 12, 2004

E'oni 

E'onis are one of the goofiest and craziest friends in their group. They are very open and talk a lot. but when it come to serious stuff they can't take it seriously. e'onis can be the funniest around their friends and family but yet be the most depressed deep down inside and no one is there for them but they don't show it. they are very talented, creative, and smart sometimes . overall e'onis are the best kind of people.

girl:"hey did you hear the news about e'oni?"
boy: "no why? is it bad or smth...?"
girl: "yeah! she farted in class but nobody cared and now it's a humorous thing."

E'oni by ChickenFungus 2.0 October 19, 2020

Big titty oni san 

A fictional older sibling with big melons

"Yo dude see that big titty oni san".
"Joseph no one's there".

Big titty oni san by Tosters_Fire July 31, 2021

Inu-Oni 

Some guy on the internet.

Inu-Oni said that your butt in humoungous, and ugly.

Inu-Oni by Kilala April 23, 2003