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"

Oni Chan by Miku kinnie September 8, 2020

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Oni Chan

When you love your brother so much!

'Ohayo, oni chan~'

Oni Chan by yourlocalcatgirluwu May 3, 2022

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oni chan

basically stepbro

omg oni chan nooo

oni chan by youwantpen March 9, 2021

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Oni chan I have dick

This term is used in Japanese hentai normally filming a young child with a fold man this man is ready to have sexual intercouse with the young child (which in the west is considered pedophile) this man is then told “oni chan I have a dick” normally the man is not phased by this and goes in for the tight pum.

Oh oni chan I have dick if you forget

OH THAT DOESNT MATTER LOVE
The man below is a know sex offender

Oni chan I have dick by Dengplural December 9, 2019