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"oneesan! Mom said to clean your room!"
Oneesan by KittyKinetc April 9, 2008
Related Words

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
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

OneEliteMofo 

One who was underestimate but destroyed any and all who dared to call him out.
Your not bad, but no where close to OneEliteMofo

You lost badly, but thats what happens when you go against a OneEliteMofo

Its only natural to leave the scene with your tail between your legs when you go vs a OneEliteMofo
OneEliteMofo by Darren Macomb October 29, 2007
Any thick messy substance or
The process of seeping
Verb
Pass gradually or leak through or as if through small openings
Release through one's pores, as of sweat
oozee by Anonymous May 9, 2003