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Onii Chan 

In Hentai language, this means older brother during sex🍆🍑🥵
Onii Chan by D@RTHV@D3R March 24, 2021

Onii Chan 

When a anime girl is ready for incest
Onii Chan by xenonn October 5, 2021

Onii Chan 

The Japanese term for Big Brother, however scientists have determined that in the world of anime when Onii Chan is heard there is a 67.2% probability that Big Brother will have become a Sisterf**ker before the end of the series.
Episode 1 - Onii Chan where are you?
Episode 5 - Onii Chan stick it in me *moans*
Onii Chan by Hachio February 19, 2023

Onii-Chan 

TLDR: Older Brother

A little more detail if you like-
Onii can end with 3 different Japanese honourifics, -San, -Chan, or -Sama.
-San is the basic ending for the basic big bro.
-Chan is a more compassionate ending for Onii if you really love your big brother and feel emotionally attached to him greatly
-Sama is a bit of a formal ending for big brother, nothing too special.
My Onii-San is a cool bro
I really love my Onii-Chan!
Yes he is my Onii-Sama
Onii-Chan by Rywen March 10, 2015

Onii-Chan 

Onii-Chan means "Big brother" in Japanese. Most people assume it's a mating call of some sort because of hentai but no that's just hentai. Lots of hentai has incest.
"Onii-chan! Drive me to my friend's house!"