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Originating from Australia, it is the safe-for-work, politically correct way to call someone a retard. Modernisation of calling someone a ‘tard’.
1. Dude, quit being a f*cking rio.

2. What the hell was that for you rio?!
3. Haha man I felt like a total rio.
by FozzaTheLegend May 05, 2020
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Rio is a bitch. He is a bully and is mean to anyone Called Summer and Amelia. Rio is always mistaken for a girl. DONT BE FRIENDS WITH ONE
Person 1: What did rio do now
Person 2 : oh rio was homophobic this time
by iamaidiotthatisdumb May 03, 2020
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Rio. noun (ree-oh) 1. A fight in which one party is agressive and the other is pacifistic. 2. A fight that is mainly one sided.
Whoa! That was a total Rio, the other guy barely moved!
by Seraphim'sZephyr April 17, 2010
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The most homo pansexual around.
If you’re male you better clench because he will take your cheeks faster than you can moan.
If your name is Nick than you have already experienced the Gud succ succ.
If your name is Tad... than you’ve given the succ succ
Rio: Nico gimme them cheeks boi.
Nick: Not if I take yours first.
Tad: Hey guys let me join!
Derek: *Pulls out gun* Everyone get on the ground at spread your cheeks.
Tad Rio and Nick: Yes Daddy!
by Ur mum gay 6ix 9ine December 11, 2018
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34
A Rio is commonly used when labelling someone or something that is mentally, but often physically, retarded, misshapen or delayed.
Oh look that guy walks funny... what a rio!
by MitchAaAaY September 22, 2008
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