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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.
sio by Sio man May 18, 2006
Related Words
siobhán sion sio siona sione Sioux city siox Siovahn Sioux Falls síoda
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."
SIO by Scutha January 11, 2008
Your fly's undone - SIO!
SIO by Zarlant August 30, 2013
"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!
SIO by Erlich Bachmann May 15, 2017
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
sio by captainchink02 August 22, 2017
Easy word to express agreement with something or simply saying yes/probably.
Mom - "Are you OK?"
Son - "Sio."
Sio by Camobeast April 15, 2018