iono 

"I Don't Know", shorter, and therefore easier to use then ionno

Someone asks you a question, your response: "Iono."

iono by DeathFyre February 7, 2004

iono 

"I don't know" or "I dunno"

Q: Dude, where the heck did you put my wallet?
A: Iono. Forgot.

iono by RoyalKnight November 16, 2003

iono 

Short for 'I Don't Know'...used by pimps,hoes,thugs and geeks online

I ono man...something really wrong with these hoes

iono by thef8lfox February 5, 2004

iono 

I dont know.

Pal 1: Whats for lunch?
Pal 2: iono

iono by Jessica February 7, 2004

iono 

A dumb way to abbreviate "I don't know" since "idk" works just as well, is shorter, and isn't retarded.

ConfusedGuy: "Why the fuck do people say 'iono'?"
SmartGuy: "idk"

iono by Brilhasti December 28, 2005

iono 

slang word used by people who dont have enough energy to say "I don't know".

Smokey, how you going to sell bud and smoke bud? iono! thats my only problem..

iono by Dick Fitswell February 4, 2004

iono 

people who are lazy or try to act cool that are meaning to say "i don't know"

iono im lazy

iono by maria February 1, 2004