Top definition
It means Input/Output.
A word in the computer person's dictionary.
by Keael June 23, 2005
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2
When referencing a pet, this term stands for Indoor/Outdoor.
That is, a dog or cat that spends as much time outside as it spends inside.
Candy is our new I/O cat -- she sleeps outside at night but comes in the house to play with our other kitties during the day.
by Telephony May 01, 2015
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