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Onii-chan 

"Good morning, Onii-chan"
Onii-chan by Odelia November 25, 2007

Onii- Chan 

To most normal people it means "brother" but...
if you're a nasty, it means "fuck buddy"
"Good morning Onii~ Chan"
Ara Ara~ Onii- Chan, you're so hard"
Onii- Chan by definetlygoingtohell February 11, 2021

Onii-chan 

When a anime girl calls her older brother "onii-chan" it means get ready for insest.
Anime girl-"onii-chan~"
*1 day later* *INSEST* Anime girl- *moAnS*
Onii-chan by SeNpAi~~~~ August 11, 2019

Onii-chanable 

Construction: Combination of the Words, Onii-chan(Big Brother)And Able(having the means or opportunity to be something.)

When someone can be a potential Big Brother type

but due to usage in the Anime Industry and in Otaku Culture, it is mostly known as the term for"Elder Brother"
"That man is responsible"
" Yeah, Totally Onii-chanable"
"What?"
"Onii-chanable."
"Wtf are you talking about jesse"
Onii-chanable by Xer Ralda December 27, 2021
Someone bigger than you calling you "Little kid" or to girls "Little girl".
Hey onii-kun, what did your parents say when you said you had a new brother? "Make sure he's not gay?"
onii-kun by urmumgeylol629 May 17, 2018