a type of harsh, aggressive punk music originally popular in the late 1970s and early 1980s
The sex pistols and the Clash would be considered "OI".
by Justin Krine June 15, 2018
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short for Oslo international school or obnoxious ignescent school
OIS is a gay POS school with a big cock
by fatmike February 12, 2003
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Usually used as a punk expression, first used in england by Cockney, means, yes, or yeh!
OI! to the punks, and OI! to the skins, but OI! to the world and everybody wins -The Vandals
by Meghan November 23, 2003
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*this word refers to the female genitals.

*it's root trace far back into time...before BC...it was the RG! the creators being: jenn and v
"JENN! damnit..just because im DRUNK doesnt mean you can just touch my OI OI and i wont care?!?!*
by Valisa June 18, 2004
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Used instead of phrases such as:
See you tomorrow
I'll do it tomorrow
Yeah, the morro

also, to "flip someone off" without the "flip" part
or simply for the sake of saying something.
1 "Yeah kid"
2 "Yeah"
1 "Oi oi the morro, then"
2 "Seven times"
1 "yeh, agree"
2 "Kill a Scret for me"
1 "Yeah, the morro"
2 "Oi Oi."
by Scret Hatin Moi November 16, 2003
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A word that best describes absolutely nothing. A word that can be searched for on dictionary . com and a definition will come up that sounds like total BS. This word is only good for ending a game in "words with friends", THATS IT!
ya so I thought he was going to beat me in words with friends, but a light bulb struck, "OI I CAN WIN THIS THING!
by oiarg July 21, 2010
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