| Abbreviation | Definition |
|---|---|
| IO | Inside Outsider |
| IOC | I'm Obviously Corrupt |
| IOC | Instead of Ordinary Coke |
| IOC | Interesting Olympic Confederation |
| IOC | Intolerant Olympic Committee |
| iOCD | iPhone Obsessive-Compulsive Disorder |
| IOD | Image Of Death |
| IOUWS | If Only You Were Smart |
| IOWA | I Owe Wisconsin Apologies |
| IOWA | Idiot Out Wheeling Around |
| IOWA | Idiots On Wheels Alert |
| IOWA | Idiots Out Walking Around |
| IOWA | Idiots Out Wandering Arizona |
| IOWA | Idiots Out Wandering Around |
| IOWA | Idiots Out Wanting Dates |
| IOWA | I'm One With Appeal |
| IOWA | I'm Only Worth Apology |
| IOWA | In Omaha Without Asking |
| IOWA | Inbreds Out Working Agriculture |
| IOWA | Inbreeding Over Wide Area |