What does IO stand for?

Insignificant Other

This definition appears very rarely and is found in the following Acronym Finder categories:

Slang/chat, popular culture

Other Resources:

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Information Orientation Information Outlet (LAN) Information Output Information Overload Infrastructure Optimization Initial Only Input Operator Input/Output Insertion Order (web advertising) Inside Out (Frisbee throw)		Inspecciòn Ocular (Guatemala, police task force) Inspectie van het Onderwijs (Dutch) Installing Officer (International Order of DeMolay) Instant Outlining Institute of Oceanography Institutional Official (various organizations) Integrated Operations (oil industry) Integrated Optics Intelligence Officer Intelligence Oversight

Samples in periodicals archive:

Second room AKA should be good too with David Duriez, Insignificant Others and Raphael Pellizzaro from Tummy Touch.

TOP 5 CLUB NIGHTS

except perhaps those few gays who want to be married; Americans who want universal health care or more money spent on education and social security; Iraqis who don't want a McDemocracy; and a few insignificant others.

Another viewpoint

On Friday, March 11 the party comes to Liverpool's baby cream at the Albert Dock, from 8pm till late and the hot house duo Insignificant Others (Skyline Records) will be providing the sound track with their super cool electro funky house.

Clubs: CD is Cream of the crop