Top Definition
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
3 more definitions
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
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
Sort It Out
Your fly's undone - SIO!
by Zarlant July 22, 2013

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