IOO

In Our Opinion. The plural form of IMO.

"Is Allan the best dressed man in the world?"

"Yes, IOO"

by SexyJosem July 21, 2012

IOOS

Short for the Infinite-On-Off-Syndrome. This annoying bug sometimes happen in Facebook where the chat system turns on and off at a rapid rate.

A: Hello
B: Sup (send as message?)
A: -offline-
A: LOL
B: WTF? (send as message?)
A: -offline-
A: I got the IOOS :P
B: =.=

by WhoAmI?IamBartMan December 18, 2010

<Chris> What time do you want to leave?
<Tim> ioo

by Johnno31 August 7, 2006

Used to define "One Hundred" in Roblox since no-one can type numbers into the chat thanks to an awful filtering system.

Baconhair123: i have IOO coins
Noob11xx: cool

by jss-urban February 4, 2021