ONI
Acronym for Office of Naval Intelligence, in the Halo book: The Fall of Reach. Possibly also used in the rest of the Halo series.
"Red Leader, sir. We've got something for ONI. We've spotted some kind of Covenant race." -Page 185, The Fall of Reach.
by Noob4sure November 26, 2005

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Top Definition
Oni
japanese word for demon or devil
that is one evil oni
by Oni-sama August 09, 2003

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Oni
Meaning sweet, kind caring and compassionate. She is smart, beautiful and will make an amazing friend.
I just became friends with Oni
by LikeTotes324 November 07, 2013

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Oni
1.Japanese Devil or Demon usually pink or purple in colour, they're tall, strong, ugly and stupid.

2.An underrated shoot 'em up for the Playstation2.
1.That Oni bit off my arm.

2.I played Oni on my PS2 last night.
by lordpestilence July 14, 2005

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Oni
O-nee

1. A game created by Bungie west studios. It featured a revolutionary blend of hand to hand combat and shooting.

2. Any game that is awesome, but gains bad reviews, and/or is abandoned for the sake of a Microsoft(TM) related project.
"Wow, this game is awesome! It will probably end up being another Oni".
by Onimotoko March 31, 2011

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Oni
A level of difficulty in Dance Dance Revolution. ddr
Theres the beginner, light, heavy, and then the oni mode
by Victor December 14, 2003

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oni
Big fat ugly Japanese ogre with horns, fangs, and an odd penchant for wearing tiger skins.

Not to be confused with waifish anime babes inexplicably dressed like oni.
Know what an oni looks like?

YOUR MOM
by tengu shoes January 07, 2005

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