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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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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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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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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 =/
by Geophreigh Twidlinkle February 08, 2008
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"Serious Inquiries Only" - often used on CL and dating sites by pros who are not into games or long back & forth.
You'll love my exotic talents. Very friendly & 420. Honest, and Discreet. Please SIO ONLY!
by Erlich Bachmann May 15, 2017
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Sio is a term relatively used by high schoolers on social media. It means "school is out", and is often used on Snapchat when users send mass snapchats for streaks after getting off school.
Luke just sent out a snap saying "s/r sio" to all of his stories, streaks, and recents. He must be out of school now
by captainchink02 August 22, 2017
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