When a person quickly and sharply slaps another person in the forehead, creating one of those classic "what the hell?" moments, which always tend to be fun.
RULES:
1. You MUST say unis when performing a unis on somebody. It is pronounced (yoo-nIS).
2. It is MANDATORY that it be on the forehead. If it is anywhere else on the body, it is null and void.
3. It is IMPERITIVE that it be a slap. Don't punch people in the forehead. You'll look like a complete retard, and it won't count anyways, so it'll just be a big lump of fail.
Dustin: (slaps John on the forehead) UNIS!
Jonathan: Damnit Dustin! What'd I tell you about that?
Kreig: (also slaps John on the forehead) Unis!
Jonathan: SON OF A BITCH!!
by TheGrimReefer986 May 17, 2011
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1. n. A high school in san diego that is home to the bitchiest/sluttiest/trashiest girls and most douche-bag resemblent guys on the planet.
2. adj. Refers to someone who exudes the attitude and bitchiness of a Uni student.
1. That girl is such a fuckin hoe...she MUST go to Uni.
2. He is sooo uni...look at how he thinks hes hot shit.
by funness March 23, 2004
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A unicorn neopet that looks like a character from 'My Little Pony'.
The Uni looks really familiar....do I smell a lawsuit?
by Alexi August 1, 2003
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UNI, BOFH of Game-Deception and Conqueror of all.
UNI is teh pwn.

Roses are red,
Violets are blue,
UNI is sweet and will pwnz0r j00.
by k0re October 14, 2004
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uniformed police officer
pronounced: ooh-nee
Two unies came by today looking for you. I told them nothing.
by inane5 April 29, 2005
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User-Network Interface
This IAD is capable of UNI 3.1 & 4.0 signaling.
by Brad March 8, 2004
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