Top definition
Noun:

1. A word that was made up for Scrabble when the only letters you have are i,i,i,o,o,u,e.

2. A creature companion used for Ninjaing
The man and his iouioei went to the NINJA BLACK-OPS WEDDING IN GERMANY.
by Zack Shook October 18, 2010
Get the mug
Get a iouioei mug for your brother-in-law Paul.