Top Definition
sio
The term "sio" is a New Zealand innovation for saying "bye". Commonly used on the phone when ending a phone conversation quickly.

Pronounced see-oh (quickly)
Chick: See you at the club later tonight?

Dude: Yup. Sio sio.
by Sio man May 11, 2006

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SIO
Significant Internet Other.

Refers to somebody with whom you spend a significant amount of time talking to online, but rarely or never see in the real world.
"Steve's my SIO"
"Wow, you spend a lot of time talking to him. Is he your SIO?"
"I had a fight with my SIO and he blocked me."
by Scutha December 31, 2007

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An acronym for the term; Self Induced Ownage Syndrome. SIOS
Meaning; to own yourself
Arrogant IRC User: Man, my penis is so big if I laid it out on a keyboard it'd go all the way from A to Z

*Approximately twenty-five seconds later*

Arrogant IRC User: Wait... sh*t

------

Misfortunate IRC User: I tried to set my hotmail password to penis.. but it said my password wasn't long enough =/
IRC User: ROFL. SIOS!
by Geophreigh Twidlinkle February 08, 2008

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SIO
Sort It Out
Your fly's undone - SIO!
by Zarlant July 22, 2013

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sio
Beast, loyal to only one girl. Takes control and leads. Strong at leading. Sexy asf. Has good style and knows how to stay cool. Unstoppable in sport.
Dam he reminds me of Sio.
by beastest November 24, 2016

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