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1.
shortened version of "i dunno", which is a shortend version of "i dont know", which is a shortend version of "i do not know"
Iono where your pencil is, find it yourself!
by karate December 07, 2003
453 98
 
2.
12 year-old internet chatter's way of saying "I don't know."
What are you doing this weekend (besides using the computer)?

Iono.
by Isi Oamen February 08, 2004
405 212
 
3.
retarded way of spelling i don't know
whats for dinner
iono
stfu
by Ben February 07, 2004
357 181
 
4.
Basically the same thing as iunno, it is a quickened version of "I do not know", used in both chatting and in informal speech.

It's history may trace back to Homer Simpson, who often makes a sound that is in between "iono" and "iunno". (Says a lot about his intelligence, doesn't it?)
PersonMan: So, whatchu up to tonight?
TriangleMan: iono. How bout j00?
PersonMan: iono.
TriangleMan: das coo.
by Mallio November 19, 2003
83 37
 
5.
Slang for "I don't know"
Steve: "How's this look?"
Jerry: "Iono. Okay, I guess."
by IKe February 07, 2004
48 25
 
6.
"I Don't Know", shorter, and therefore easier to use then ionno
Someone asks you a question, your response: "Iono."
by DeathFyre February 07, 2004
40 27
 
7.
"I don't know" or "I dunno"
Q: Dude, where the heck did you put my wallet?
A: Iono. Forgot.
by RoyalKnight November 16, 2003
33 20