Onnee 

A sweet faced girl whose appearance belies the fact she has the verbal dexterity of a politician on cocaine. Also see feisty

Oh my goodness, that comment was so brutal, it's like someone Onnee would say.

Onnee by Jhml December 27, 2019

Oneesan 

Japanese word for "big sister"

"oneesan! Mom said to clean your room!"

Oneesan by KittyKinetc April 9, 2008

onee-sama 

A Japanese term made of these parts:
1. The 'o-' prefix, indicating a respectful tone.
2. 'nee', meaning 'sister'.
3. The '-sama' suffix, an honorific denoting extreme respect as might be used when addressing noble figures or gods.

Onee-sama is an unusual, overly formal way of referring to one's sister. For most everyday purposes, the neutrally formal 'onee-san' or familiar 'onee-chan' would suffice: only those raised in highly formal settings would even contemplate using 'onee-sama' in a non-sarcastic way (as one might say in English 'oh of course your highness').

'Onee-sama' is a term mostly popularised by manga and anime, specifically shoujo-ai (love between young girls) series set in high-class boarding schools (see Strawberry Panic for a textbook example). Because of this association, 'onee-sama' is inextricably tied to the more elegant side of the shoujo-ai genre: a young girl using the term to address an older, unrelated girl could be hinting at a deeper relationship between the two of them. Or they could just be messing with you.

IRL (sort of): "Onee-sama, I hope you aren't labouring under the misapprehension that your seniority over me justifies you putting on airs."
Shoujo-ai fantasy: "Onee-sama, would you please become my soeur?"

onee-sama by Kazzius November 22, 2013

onee-chan 

Onee-chan is Japanese for older sister.

"Good morning, Onee-chan"

onee-chan by Makayo July 12, 2006

ownee 

being owned by someone or something

I live with 3 cats but no one ever owns a cat. They, on the other hand own me, or think they do. Therefore I am their ownee.

ownee by Ownee of 3 cats April 4, 2009

onner 

Someone who is getting ‘on’ any sort of video games. Used when asking if someone will become gamer.

Any onners?

onner by KnockOffKyloRen October 5, 2020

oneesa

Oneesa is the name that one cool kids get people named oneesa get lots of friends and boys 😉

Boy1: oh she’s cute what’s her name?
Boy2: Oneesa!
Boy1: oh say less!

oneesa by Shy with a C October 24, 2020